1. Department of Medicine, Karolinska Institutet, Solna, Sweden
2. Department of Medicine, Karolinska Institutet, Huddinge, Sweden
3. GHP Stockholm Gastro Center, Stockholm, Sweden
4. Department of Medicine, Ersta Hospital, Stockholm, Sweden
5. Division of Gastroenterology, Karolinska University Hospital, Stockholm, Sweden
6. GI-unit, Department of Medicine, Danderyd Hospital, Danderyd, Sweden