1. Department of Thoracic Surgery, West China Hospital, Sichuan University, Chengdu, China
2. Department of Thoracic Surgery, Hospital of Chengdu Office of People’s Government of Tibetan Autonomous Region, Chengdu, Sichuan, China
3. Division of Gastroenterology, Hospital of Chengdu Office of People’s Government of Tibetan Autonomous Region, Chengdu, Sichuan, China