1. Department of Hepatopancreatobiliary Surgery, Affiliated Hospital of Qinghai University, Xining, Qinghai 810001, P.R. China
2. Department of Urology, West China School of Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
3. State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center, Chengdu, Sichuan 610041, P.R. China
4. Department of Ultrasound, West China School of Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
5. The University of Miami Leonard M. Miller School of Medicine, University of Miami, Coral Gables, FL 33136, USA