1. Massachusetts General Hospital; Division of Nephrology, Department of Medicine; Boston USA MA 02114
2. Odense University Hospital; Department of Gastroenterology and Hepatology; Sdr. Boulevard 29 Odense C Denmark 5000
3. Massachusetts General Hospital and Harvard Medical School; Division of Gastroenterology; 55 Fruit St Boston USA MA 02114
4. Brigham and Women's Hospital; Division of Gastroenterology, Hepatology and Endoscopy; Boston USA MA 02115
5. Copenhagen University Hospital Hvidovre; Gastrounit, Medical Division; Kettegaards Alle Hvidovre Denmark 2650