1. General Surgery Department, Istituti clinici Zucchi of Monza, University of Milano-Bicocca , 20126 , Milan , Italy
2. Department of Medicine and Health Sciences “V. Tiberio,” University of Molise, Via Francesco De Sanctis 1 , 86100 , Campobasso , Italy
3. General Surgery Department, Policlinico Umberto I, University La Sapienza of Rome , 00161 , Rome , Italy
4. General Surgery Department, University Hospital of Roma “Tor Vergata,” 00133 , Rome , Italy
5. General Surgery Department, IRCCS Policlinico San Donato of Milano , 20097 , Milan , Italy
6. General Surgery Department, Clinica Villa Delle Querce , 80136 , Naples , Italy
7. General Surgery Department, Ospedale San Gerardo di Monza, University of Milano-Bicocca , 20900 , Milan , Italy
8. General Surgery Department, Hospital of Gallarate , 21013 , Varese , Italy
9. Department of Clinical Medicine and Surgery, University of Naples “Federico II,” Via S. Pansini, 5 , 80131 Naples , Italy
10. General Surgery Department, Casa di Cura Fabia Mater , 00171 , Rome , Italy
11. General Surgery Department, Ospedale Multimedica San Giuseppe of Milano , 20123 , Milan Italy
12. Department of Public Health, University of Naples “Federico II,” Via S. Pansini, 5 , 80131 Naples , Italy