1. Department of Hepatobiliary Surgery, Bayannur Hospital, Bayannur, Inner Mongolia Autonomous Region 015000, P.R. China
2. Department of Hepatobiliary, Pancreatic and Splenic Surgery, Affiliated Dongguan Hospital, Southern Medical University (Dongguan People's Hospital), Dongguan, Guangdong 523058, P.R. China
3. Department of Hepatobiliary‑Pancreatic‑Splenic Surgery, Inner Mongolia Autonomous Region People's Hospital, Hohhot, Inner Mongolia Autonomous Region 010017, P.R. China
4. Department of Pancreatic Hepato‑Biliary‑Surgery, The Sixth Affiliated Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510655, P.R. China