1. Department of Gastroenterology and Alimentary Tract Surgery; Tampere University Hospital and School of Medicine; University of Tampere; Tampere Finland
2. Department of Medicine; Seinäjoki Central Hospital; Seinäjoki Finland
3. Research Department; The Social Insurance Institution; Turku Finland
4. School of Health Sciences; University of Tampere; Tampere Finland
5. Centre for Child Health Research; University of Tampere and Tampere University Hospital; Tampere Finland
6. Kuopio University Hospital; Kuopio Finland
7. North Karelia Central Hospital; Joensuu Finland
8. South Karelia Central Hospital; Lappeenranta Finland
9. Kymenlaakso Central Hospital; Kotka Finland
10. Satakunta Central Hospital; Pori Finland
11. Vaasa Central Hospital; Vaasa Finland
12. Mikkeli Central Hospital; Mikkeli Finland
13. Länsi-Pohja′s Central Hospital; Kemi Finland
14. Keski-Pohjanmaa′s Central Hospital; Kokkola Finland