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- biomed central13
- department of acute and digestive surgery, haukeland university hospital, bergen, norway; departments of clinical medicine, university of bergen, bergen, norway10
- department of gastrointestinal surgery, rigshospitalet, copenhagen, denmark10
- department of gastrointestinal surgery, stavanger university hospital, stavanger, norway10
- department of gastrointestinal surgery, university hospital of north, tromso, norway10
- department of hepato-pancreato-biliary surgery, oslo university hospital, oslo, norway10
- department of surgery, aarhus university hospital, aarhus n, denmark10
- department of surgery, institute of clinical sciences, university of gothenburg, sahlgrenska university hospital, gothenburg, sweden10
- department of surgery, odense university hospital, odense c, denmark10