1. Clinical Epidemiology and Biostatistics Unit; Örebro University Hospital; Örebro; Sweden
2. Department of Gastroenterology and Hepatology; Karolinska University Hospital; Stockholm; Sweden
3. Department of Gastroenterology; Skåne University Hospital; Malmö; Sweden
4. Division of Gastroenterology and Hepatology; Faculty of Health Sciences; Linköping University; Linköping; Sweden
5. Division of Gastroenterology; Department of Medicine; Sahlgrenska University Hospital; Gothenburg; Sweden
6. Department of Gastroenterology; Skåne University Hospital; Lund; Sweden
7. Department of Medicine; NÄL Hospital; Trollhättan; Sweden
8. Division of Gastroenterology; Department of Medicine; South Hospital; Stockholm; Sweden
9. Division of Gastroenterology; Department of Internal Medicine and Geriatrics; Sahlgrenska University Hospital/Östra Hospital; Gothenburg; Sweden
10. Skaraborgs Hospital; Linköping; Sweden
11. Department of Medical Sciences; Gastroenterology Research Group; University Hospital; Uppsala; Sweden
12. Department of Gastroenterology; Ersta Hospital; Stockholm; Sweden