1. Department of Medicine and Surgery, S. Maria Hospital University of Perugia Terni Italy
2. Deparment of General and Emergency Surgery General and Emergency Surgical Clinic of Ancona Ancona Italy
3. Surgical Emergency Unit, John Radcliffe Hospital Oxford University NHS Foundation Trust Oxford UK
4. Department of Surgical Sciences “Sapienza” University of Rome, Azienda Policlinico Umberto I Viale del Policlinico Rome Italy
5. Department of Pediatric Surgery, Meyer Children's Hospital University of Florence Florence Italy
6. Department of General and Specialist Surgery “Paride Stefanini” Sapienza University, Azienda Policlinico Umberto I Viale del Policlinico Rome Italy