1. General Surgery Unit, ASST Brianza—Vimercate Hospital, 20871 Vimercate, Italy
2. General Surgery Residency Program, University of Milan, 20122 Milan, Italy
3. Trauma Center and Emergency Surgery, ASST Great Metropolitan Hospital Niguarda, 20162 Milan, Italy
4. General Surgery Residency Program, University of Pavia, 27100 Pavia, Italy
5. Department of General Surgery, Juntendo University Nerima Hospital, Tokyo 177-8521, Japan
6. Ruttonjee & Tang Siu Kin Hospital, Hong Kong, China