1. Department of Gastroenterology and Hepatology, University of Virginia, Charlottesville, Virginia, United States
2. Department of Medicine, Penn State Health Milton S. Hershey Medical Center, Hershey, Pennsylvania, United States
3. Department of Surgery, University Medical Centre Groningen, Groningen, The Netherlands
4. I Clinica Medica, Department of Internal Medicine and Medical Specialties, Sapienza University of Rome, Rome, Italy