1. Department of Gastroenterology and Hepatology; Feinberg School of Medicine; Northwestern University; Chicago IL USA
2. Institute of Social and Preventive Medicine; University of Bern; Bern Switzerland
3. Clinical Trials Unit; University of Bern; Bern Switzerland
4. Adare Pharmaceuticals; Lawrenceville NJ USA
5. Division of Gastroenterology and Hepatology; Centre Hospitalier Universitaire Vaudois and University of Lausanne; Lausanne Switzerland
6. Division of Gastroenterology; Department of Medicine; Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA