1. Abdominal Center, Gastroenterology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
2. Pfizer Oy, Helsinki, Finland
3. Department of Internal Medicine, Kanta-Häme Central Hospital, Hämeenlinna, Finland
4. Department of Internal Medicine, Päijät-Häme Central Hospital, Lahti, Finland
5. Department of Internal Medicine, Vaasa Central Hospital, Vaasa, Finland
6. Department of Internal Medicine, Kuopio University Hospital, Kuopio, Finland
7. Medaffcon Oy, Espoo, Finland
8. Pfizer AB, Stockholm, Sweden
9. Department of Medical Sciences, Uppsala University, Uppsala, Sweden