1. Department of Hepatobiliary Surgery, Chengdu Second People's Hospital, Chengdu, China.
2. Department of Thoracic Surgery, Dujiangyan Medical Center, Dujiangyan, Chengdu, China.
3. Department of General Surgery, Nanchong Central Hospital, The Second Clinical College of North Sichuan Medical College, Nanchong, China.
4. Department of Hepatobiliary Surgery, Dujiangyan Medical Center, Dujiangyan, Chengdu, China.