1. Department of Liver Surgery, West China Hospital of Sichuan University, Chengdu, Sichuan, China.
2. West China School of Nursing, Sichuan University, Chengdu, Sichuan, China.
3. Department of Hepato-pancreato-biliary Surgery, First People's Hospital of Neijiang, Neijiang, Sichuan, China.
4. Department of Hepato-pancreato-biliary Surgery, Chengdu Second People's Hospital, Chengdu, Sichuan, China.