1. Department of Anatomical, Histological, Forensic Medicine and Orthopedic Sciences; University of Rome ‘Sapienza’; Rome Italy
2. Eleonora Lorillard Spencer-Cenci Foundation; Rome Italy
3. Department of Health Science; University of Rome ‘Foro Italico’; Rome Italy
4. Department of Surgical Sciences; University of Rome ‘Sapienza’; Rome Italy
5. Scott & White Digestive Disease Research Center; Central Texas Veterans Health Care System and Texas A&M Health Science Center; College of Medicine; Temple TX USA
6. Department of Physiology; Tufts University; Boston MA USA