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51.
  • Byenfeldt, Marie, 1967- (författare)
  • Ultrasound based shear wave elastography of the liver : a non-invasive method for evaluation of liver disease
  • 2020
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Background: Detecting liver disease at an early stage is important, given that early intervention decreases the risk of developing cirrhosis and subsequently hepatocellular cancer (HCC). The non-invasive ultrasound-based shear wave elastography (SWE) has been used clinically for a decade to assess liver stiffness. This method is reliable, rapid and can be performed in an outpatient setting without known risks for the patient. However, increased variance in SWE results has been detected, without clear explanation. Factors that affect SWE results needs to be identified. Data are insufficient regarding the reliability of SWE with different body positions and probe pressures. Men have higher SWE results than women, also for unclear reasons. Increasing the reliability of SWE is crucial for understanding how factors such as overweight and obesity, cardiovascular and antiviral medication, age, sex, smoking habits, hepatic steatosis and cirrhosis affect SWE results.Aims: The overall aim of the studies included in this thesis was to increase the reliability of SWE liver. The specific aims were to investigate patient-related factors associated with increased uncertainty in SWE results. Another aim was to investigate the influence of increased intercostal probe pressure on liver stiffness assessment with SWE liver.  The final aims were to investigate the influence of postural changes, sagittal abdominal diameter (SAD) and skin-to-liver capsule distance (SCD) on SWE results, along with sex-based differences for SWE results and cardiovascular medication.Methods: All enrolled participants in these studies were consecutive patients with various liver diseases presenting at the radiology department Östersunds Hospital. The patients were examined using SWE liver method at the ultrasound unit between April 2014 and May 2018. Inclusion criteria were that participants be adults (age ≥18 years) who had provided written consent for participating in the study. The exclusion criterion was an inability to communicate. Current guidelines for SWE of the liver were used in the thesis with the following exceptions: In study II, increased intercostal probe pressure was used, and in study III, postural change was used. Study I included 188 patients; study II included 112 patients, and studies III and IV involved 200 patients. The four studies were conducted as cross-sectional and clinical trial, using quantitative methods.Results: Factors associated with low variance for SWE results were age, sex, and presence of cirrhosis, the use of antiviral and/or cardiovascular medication, smoking habits, and body mass index.  Factors associated with increased uncertainty in SWE results were increased SCD and the presence of steatosis. With increased probe pressure SCD decreased and the quality of shear wave increased. The results showed that the number of required measurements can be reduced. A postural change to left decubitus decreased SCD. For patients with increased SAD and increased SWE result in the supine position, SWE result decreased with a postural change to left decubitus.  The SWE results, SCD and SAD significantly differed between women and men. SWE results was higher in the presence of increased SAD (≥23 cm) among men, but not among women.Conclusions:  SWE of the liver is a reliable, non-invasive method for diagnosing liver disease. Results in this thesis suggest that for patients with SCD ≥2.5 cm, shear wave measures could be of poor quality and the SWE exam less reliable. In these cases, increased probe pressure may facilitate a reliable SWE exam. With such adjustments in probe pressure, the ultrasound-based SWE method can be superior for examination in patients with overweight or obesity. An effect of SAD ≥23 cm was seen for men with liver fibrosis only, which may explain the higher SWE result for men compared to women. Depending on the severity of liver disease and SAD, a postural change to left decubitus can produce a different outcome. As SAD increased, liver stiffness did, as well. Increased SAD thus is linked to increased liver stiffness, indicating that SAD should be taken into account when performing SWE of the liver.
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52.
  • Claasen, Marco P. A. W., et al. (författare)
  • An international multicentre evaluation of treatment strategies for combined hepatocellular-cholangiocarcinoma
  • 2023
  • Ingår i: JHEP REPORTS. - : Elsevier. - 2589-5559. ; 5:6
  • Tidskriftsartikel (refereegranskat)abstract
    • Background & Aims: Management of combined hepatocellular-cholangiocarcinoma (cHCC-CCA) is not well-defined. Therefore, we evaluated the management of cHCC-CCA using an online hospital-wide multicentre survey sent to expert centres.Methods: A survey was sent to members of the European Network for the Study of Cholangiocarcinoma (ENS-CCA) and the International Cholangiocarcinoma Research Network (ICRN), in July 2021. To capture the respondents' contemporary decision making process, a hypothetical case study with different tumour size and number combinations was embedded.Results: Of 155 surveys obtained, 87 (56%) were completed in full and included for analysis. Respondents represented Europe (68%), North America (20%), Asia (11%), and South America (1%) and included surgeons (46%), oncologists (29%), and hepatologists/gastroenterologists (25%). Two-thirds of the respondents included at least one new patient with cHCC-CCA per year. Liver resection was reported as the most likely treatment for a single cHCC-CCA lesion of 2.0-6.0 cm (range: 73-93%) and for two lesions, one up to 6 cm and a second well-defined lesion of 2.0 cm (range: 60-66%). Nonetheless, marked interdisciplinary differences were noted. Surgeons mainly adhered to resection if technically feasible, whereas up to half of the hepatologists/gastroenterologists and oncologists switched to alternative treatment options with increasing tumour burden. Fifty-one (59%) clinicians considered liver transplantation as an option for patients with cHCC-CCA, with the Milan criteria defining the upper limit of inclusion. Overall, well-defined cHCC-CCA treatment policies were lacking and management was most often dependent on local expertise.Conclusions: Liver resection is considered the first-line treatment of cHCC-CCA, with many clinicians supporting liver transplantation within limits. Marked interdisciplinary differences were reported, depending on local expertise. These findings stress the need for a well-defined multicentre prospective trial comparing treatments, including liver transplantation, to optimise the therapeutic management of cHCC-CCA.Impact and implications: Because the treatment of combined hepatocellular-cholangiocarcinoma (cHCC-CCA), a rare form of liver cancer, is currently not well-defined, we evaluated the contemporary treatment of this rare tumour type through an online survey sent to expert centres around the world. Based on the responses from 87 clinicians (46% surgeons, 29% oncologists, 25% hepatologists/gastroenterologists), representing four continents and 25 different countries, we found that liver resection is considered the first-line treatment of cHCC-CCA, with many clinicians supporting liver transplantation within limits. Nonetheless, marked differences in treatment decisions were reported among the different specialties (surgeon vs. oncologist vs. hepatologist/ gastroenterologist), highlighting the urgent need for a standardisation of therapeutic strategies for patients with cHCC-CCA.
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53.
  • Dehlaghi Jadid, Kaveh, 1985-, et al. (författare)
  • Long term oncological outcomes for laparoscopic versus open surgery for rectal cancer - A population-based nationwide noninferiority study
  • 2022
  • Ingår i: Colorectal Disease. - : Wiley. - 1462-8910 .- 1463-1318. ; 24:11, s. 1308-1317
  • Tidskriftsartikel (refereegranskat)abstract
    • Aim The aim of this work was to compare the 5-year overall survival in a national cohort of patients undergoing curative abdominal resection for rectal cancer by laparoscopic (LAP) or open (OPEN) surgery. Method All patients diagnosed with clinical Stage I-III rectal cancer and who underwent LAP or OPEN abdominal curative surgery in Sweden between 2010 and 2016 were retrieved from the Swedish Colorectal Cancer Registry. A noninferiority study design was employed with a statistical power of 90%, a one-side type I error of 2.5% and a noninferiority margin of 2%. The analyses were performed as intention-to-treat and the relationship between surgical technique and overall mortality within 5 years was analysed. Multilevel regression models with the patients matched by propensity scores adjusted for patient- and tumour-related variables were used. Results A total of 8410 Stage I-III cancer patients were included. This group underwent 2094 LAP (24.9%) and 6316 OPEN (75.1%) procedures and were followed until 31 December 2020. Multivariable Cox regression demonstrated that 5-year overall survival was higher in the LAP group [hazard ratio (HR) 0.877; 95% CI 0.877-0.993]. The outcome was similar when multiple imputation and propensity score matching were employed. When cT4 patients were excluded there was no difference (HR 0.885; 95% CI 0.790-1.033). At 5-years' follow-up local recurrence was not different, at 2.9% for the LAP group and 3.6% for the OPEN group (p = 0.075), while metastatic disease was more frequent in the OPEN group (19.6% compared with 15.6% for LAP; p < 0.001). Conclusion This study demonstrated that the LAP technique was not inferior to OPEN surgery with regard to overall 5-year survival. These results support the use of laparoscopic surgery.
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54.
  • Edholm, David, et al. (författare)
  • Abandoning resectional intent in patients initially deemed suitable for esophagectomy : a nationwide study of risk factors and outcomes
  • 2021
  • Ingår i: Diseases of the esophagus. - : Oxford University Press (OUP). - 1120-8694 .- 1442-2050. ; 34:3
  • Tidskriftsartikel (refereegranskat)abstract
    • The main curative treatment modality for esophageal cancer is resection. Patients initially deemed suitable for resection may become unsuitable, most commonly due to signs of generalized disease or having become unfit for surgery. The aim was to assess risk factors for abandoning esophagectomy and its impact on survival. All patients diagnosed with an esophageal or gastroesophageal junction cancer in the Swedish National Register for Esophageal and Gastric Cancer from 2006-2016 were included and risk factors associated with becoming ineligible for resection were analyzed in multivariable logistic regression analysis. Overall survival was explored by multivariable Cox regression models. Among 1,792 patients planned for resection, 189 (11%) became unsuitable for resection before surgery and 114 (6%) had exploratory surgery without resection. Intermediate and high educational levels were associated with an increased probability of resection (odds ratio (OR) 1.46, 95% CI 1.05-2.05, OR 1.92, 95% CI 1.28-2.87, respectively) as was marital status (married: OR 1.37, 95% CI 1.01-1.85). Clinically advanced disease (cT4: OR 0.38, 95% CI 0.16-0.87; cN3: OR 0.27, 95% CI 0.09-0.81) and neoadjuvant treatment were associated with a decreased probability of resection (OR 0.62, 95% CI 0.46-0.88).Five-year survival for non-resected patients was only 4.5% although neoadjuvant treatment was associated with improved survival (HR 0.75, 95% CI 0.56-0.99). Non-resected patients with squamous cell carcinoma had comparatively reduced survival (HR 1.64, 95% CI 1.10-2.43). High socioeconomic status was associated with an increased probability of completing the plan to resect whereas clinically advanced disease and neoadjuvant treatment were independent factors associated with increased risk of abandoning resectional intent.
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55.
  • Ekberg, Sara, et al. (författare)
  • Trends in the prevalence, incidence and survival of non-Hodgkin lymphoma subtypes during the 21st century - a Swedish lymphoma register study
  • 2020
  • Ingår i: British Journal of Haematology. - : Wiley. - 0007-1048 .- 1365-2141. ; 189:6, s. 1083-1092
  • Tidskriftsartikel (refereegranskat)abstract
    • Non-Hodgkin lymphoma (NHL) prognosis has improved in recent years, yet the number of patients living with the diagnosis, i.e. the prevalence, has seldom been reported. The prevalence provides a measure of the burden of disease, useful for healthcare planning and to optimise resource allocation. We provide a systematic presentation of temporal trends in absolute numbers of prevalent patients by NHL subtypes, linking them to trends in incidence, survival and mortality. Patients diagnosed 2000-2016 were identified in the national Swedish lymphoma register. Incidence and mortality rates, relative survival and prevalence were estimated for NHL overall and for major clinical and morphological subtypes. Poisson regression was used to test for temporal trends. Increasing incidence and improved survival have led to a 47% increase in the five-year prevalence of NHL overall in 2016 compared to 2004. An increasing prevalence was observed for all investigated subtypes during the study period, but most notably for diffuse large B cell lymphomas among aggressive subtypes (66%), and marginal zone lymphomas among indolent subtypes (135%). This dramatic increase in NHL prevalence underscores the need to develop and evaluate alternative follow-up schemes to use resources efficiently and still ensure optimal care of lymphoma survivors.
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56.
  • Elhag, Wahiba, et al. (författare)
  • Nutritional Deficiencies Among Adolescents Before and After Sleeve Gastrectomy : First Study with 9-Year Follow-up
  • 2022
  • Ingår i: Obesity Surgery. - : Springer. - 0960-8923 .- 1708-0428. ; 32:2, s. 284-294
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Globally, only two studies appraised the long-term nutritional status of adolescents after laparoscopic sleeve gastrectomy (LSG). Methods: Retrospective chart review of all adolescents aged ≤ 18 years who underwent LSG with ≥ 5 years follow-up and had no subsequent revisional surgery (N = 146). We assessed 15 nutritional parameters preoperatively and at 1, 3, 5, 7, and 9 years post surgery. Results: Mean age was 16.51 ± 1.29 years, 51% were males. We identified three patterns:1) Significant worsening of preoperative deficiencies: 4.7% and 0.8% of the sample exhibited zinc and vitamin B12 deficiencies, worsening to 20.8% and 12.8% at 1 year, respectively. Likewise, 0.7% of the sample had low total protein, worsening to 8.3% at year 3. A total of 32.4% of females had preoperative low hemoglobin worsening to 57.9% at year 5.2) Significant improvement: the percentage of males with preoperative low hemoglobin (5.6%) was reduced to 4.1% and 5.1% at years 1 and 3, respectively.3) Persistent deficiency: all (100%) of adolescents had preoperative vitamin D deficiency that persisted through years 3 and 9 at 90.5% and 100%, respectively. The most common complications were food intolerance (51%), vomiting (47.5%), gastritis/ esophagitis (35.7%), and gastroesophageal reflux disease (20.3%). We observed one case of Wernicke’s encephalopathy. Across the 9 years, 15.4% of the adolescents underwent intra-abdominal surgeries where 12.6% had cholecystectomy and one patient had appendectomy. Conclusion: Adolescents had several preoperative nutritional deficiencies, most of which worsened or persisted on the long term. This is the first study among adolescents to assess such deficiencies beyond 5 years. Graphical Abstract: [Figure not available: see fulltext.]. 
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57.
  • Elliot, Anders H., et al. (författare)
  • Pretreatment MRI in Primary Rectal Cancer as a Predictor for Oncological Outcomes After Surgery for Local Recurrence
  • 2021
  • Ingår i: Anticancer Research. - : Anticancer Research USA Inc.. - 0250-7005 .- 1791-7530. ; 41:5, s. 2459-2465
  • Tidskriftsartikel (refereegranskat)abstract
    • Background/Aim: For patients with locally recurrent rectal cancer (LRRC) extensive surgery is often the only curative option and patient selection is crucial. This study aimed to investigate whether magnetic resonance imaging (MRI) characteristics of the primary tumour can predict oncological outcome after surgery for locally recurrent rectal cancer (LRRC). Patients andMethods: All patients undergoing surgery for LRRC with a curative intent at the Karolinska University Hospital 2003-2013 were included. MRI examinations of the primary tumour were re-evaluated.Results: In total, 54 patients were included. A tumour volume decrease of <70% after preoperative radiotherapy or chemoradiotherapy (C)RT for the primary tumour was correlated with a lower proportion of R0 resection of the LRRC (OR=0.07, 95% CI=0.01-0.84). No association between MRI characteristics of the primary tumour and prognosis after LRRC surgery was found.Conclusion: Long-term outcomes after surgery for LRRC were not significantly associated with MRI characteristics of the index tumour. However, factors associated with increased risk of R1 resection of LRRC were identified.
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58.
  • Gadan, Soran, et al. (författare)
  • Defunctioning stoma and short- and long-term outcomes after low anterior resection for rectal cancer : a nationwide register-based cohort study
  • 2021
  • Ingår i: International Journal of Colorectal Disease. - : Springer. - 0179-1958 .- 1432-1262. ; 36:7, s. 1433-1442
  • Tidskriftsartikel (refereegranskat)abstract
    • PURPOSE: A defunctioning stoma reduces the risk of symptomatic anastomotic leakage after low anterior resection for rectal cancer and mitigates the consequences when a leakage occurs, but the impact on mortality and oncological outcomes is unclear. The aim was to investigate the associations of a defunctioning stoma with short- and long-term outcomes in patients undergoing low anterior resection for rectal cancer.METHODS: Data from all patients who underwent curative low anterior resection for rectal cancer between 1995 and 2010 were obtained from the Swedish Colorectal Cancer Register. A total of 4130 patients, including 2563 with and 1567 without a defunctioning stoma, were studied. Flexible parametric models were used to estimate hazard ratios for all-cause mortality, 5-year local recurrence, and distant metastatic disease in relation to the use of defunctioning stoma, adjusting for confounding factors and accounting for potential time-dependent effects.RESULTS: During a median follow-up of 8.3 years, a total of 2169 patients died. In multivariable analysis, a relative reduction in mortality was observed up to 6 months after surgery (hazard ratio = 0.82: 95% CI 0.67-0.99), but not thereafter. After 5 years of follow-up, 4.2% (173/4130) of the patients had a local recurrence registered and 17.9% (741/4130) had developed distant metastatic disease, without difference between patients with and without defunctioning stoma.CONCLUSION: A defunctioning stoma is associated with a short-term reduction in all-cause mortality in patients undergoing low anterior resection for rectal cancer without any difference in long-term mortality and oncological outcomes, and should be considered as standard of care.
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59.
  • Grahn, Oskar, et al. (författare)
  • Postoperative non-steroidal anti-inflammatory drugs in relation to recurrence, survival and anastomotic leakage after surgery for colorectal cancer
  • 2022
  • Ingår i: Colorectal Disease. - : Blackwell Publishing. - 1462-8910 .- 1463-1318. ; 24:8, s. 933-942
  • Tidskriftsartikel (refereegranskat)abstract
    • AIM: To investigate whether non-steroidal anti-inflammatory drugs (NSAIDs) could be beneficial or harmful when used perioperatively for colorectal cancer patients, as inflammation may affect occult disease and anastomotic healing.METHODS: This is a protocol-based retrospective cohort study on colorectal cancer patients operated between 2007 and 2012 at 21 hospitals in Sweden. The NSAID exposure was retrieved from postoperative analgesia protocols, while outcomes and patient data were retrieved from the Swedish Colorectal Cancer Registry. Older or severely comorbid patients, as well as those with disseminated or non-radically operated tumours were excluded. Multivariable regression with adjustment for confounders was performed, estimating hazard ratios (HRs) for long-term and odds ratios (ORs) for short-term outcomes, including 95% confidence intervals (CIs).RESULTS: Some 6945 patients remained after exclusion, of which 3996 were treated at hospitals where an NSAID protocol was in place. No association was seen between NSAIDs and recurrence-free survival (HR 0.97; 95% CI 0.87-1.09). However, a reduction in cancer recurrence was detected (HR 0.83; 95% 0.72-0.95), which remained significant when stratifying into locoregional (HR 0.68; 95% CI 0.48-0.97) and distant recurrences (HR 0.85; 95% CI 0.74-0.98). Anastomotic leakage was less frequent (HR 0.69%; 95% CI 0.51-0.94) in the NSAID-exposed, mainly due to a risk reduction in colo- and ileo-rectal anastomoses (HR 0.47; 95% CI 0.33-0.68).CONCLUSION: There was no association between NSAID exposure and recurrence-free survival, but an association with improved cancer recurrence and the rate of anastomotic leakage was detected, which may depend on tumour site and anastomotic location.
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60.
  • Haenni, Arvo, et al. (författare)
  • Circulating magnesium status is associated with type 2 diabetes remission after Roux-en-Y gastric bypass surgery : a long-term cohort study
  • 2021
  • Ingår i: Surgery for Obesity and Related Diseases. - : Elsevier. - 1550-7289 .- 1878-7533. ; 17:2, s. 299-307
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: Low serum magnesium levels predict cardiovascular and all-cause mortality in patients with typ 2 diabetes.SETTING: Outpatient clinic of obesity and central hospital.OBJECTIVES: To assess long-term alterations in circulating magnesium status after Roux-en-Y gastric bypass (RYGB) surgery and associations with remission of type 2 diabetes (T2D).METHODS: Retrospective analysis of 5-year outcomes of plasma magnesium (p-Mg) and glucometabolic statuses in patients who underwent primary RYGB and who completed the annual follow-up program. Data were investigated from 84 patients without diabetes and 62 with T2D before RYGB, who showed either prolonged remission (n = 30), temporary remission (n = 16), or no remission (n = 16) after surgery.RESULTS: Body mass indexes before RYGB were similar in patients with and without T2D, irrespective of remission. The patients not achieving remission showed longer diabetes durations; higher circulating glucose levels; more intensive antidiabetic drug treatment, including insulin; and significantly lower p-Mg concentrations (.73 [±.08] mmol/L compared with .80-.82 [±.07] mmol/L, respectively; P < .01) than the groups showing remission or without diabetes before surgery. After RYGB, the p-Mg increased similarly, by 10-12% in the groups with T2D before surgery, irrespective of remission; however, the nonremission group did not reach the p-Mg levels registered in the other groups after follow-up. The nonremission group reached .82 (.09) mmol/L, compared with .87 (.06) and .88 (.08) mmol/L (P < .05), respectively, in patients with remission or without a history of diabetes.CONCLUSION: The p-Mg concentrations increased after RYGB, with similar increments irrespective of T2D remission; however, the nonremission group started from an inferior level and did not reach the p-Mg concentrations seen in the groups achieving remission or without a history of diabetes before surgery.
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