1. Gastrointestinal Research Unit, Departments of Gastroenterology and Surgery, University Medical Center Utrecht, Utrecht, The Netherlands
2. Section of Internal Medicine, Department of Internal and Public Medicine, University of Bari, Bari, Italy
3. Department of Gastroenterology Meir Medical Center, Kfar Saba, and the Minerva Center for Gallstones and Lipid Metabolism in the Liver, Tel Aviv University, Tel Aviv, Israel