1. Department of General Surgery, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an 710004, Shaanxi, China
2. Department of Hepatobiliary Surgery, First Affiliated Hospital of Xi’an Jiaotong University, Xi’an 710061, Shaanxi, China
3. Center of Gallbladder Disease, Shanghai East Hospital, Institute of Gallstone Disease, School of Medicine, Tongji University, Shanghai 200092, China