CHU DE NANTES (Hôpital Nord Laennec), Saint- Herblain, France
CH de Valenciennes, Valenciennes, France
CHU d'Amiens, Amiens, France
Gastroenterology Department, Ersta Hospital, Stockholm, Sweden
Gastroenterology Department, Danderyds Hospital, Stockholm, Sweden
Department of Medical Sciences Gastroenterology and Hepatology, Uppsala University Hospital, Uppsala, Sweden