1. Department of Pediatric Surgery, Hospital of The University of Electronic Science and Technology of China and Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, P.R. China
2. Department of Hepatobiliary Surgery, Hospital of The University of Electronic Science and Technology of China and Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, P.R. China
3. Department of Ultrasound, Hospital of The University of Electronic Science and Technology of China and Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, P.R. China
4. Department of Thoracic Surgery, Hospital of The University of Electronic Science and Technology of China and Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, P.R. China