1. Department of Liver Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
2. Department of Outpatient, West China Hospital, Sichuan University, Chengdu 610041, China
3. Department of Vascular Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
4. Department of Health Management, West China Fourth Hospital, Sichuan University, Chengdu 610093, China