Corresponding author. Department of General Surgery, People's Hospital of Tibet Autonomous Region, Lhasa, 850000, China.; Department of General Surgery, People's Hospital of Tibet Autonomous Region, Lhasa, 850000, China
Dun-zhu Ba Sang
Department of General Surgery, People's Hospital of Tibet Autonomous Region, Lhasa, 850000, China
Guo-hui Bai
Department of General Surgery, People's Hospital of Tibet Autonomous Region, Lhasa, 850000, China
Jun Zhang
Department of General Surgery, Peking University First Hospital, Peking, 100000, China