1. Department of Ultrasound Diagnostics The Affiliated Changsha Central Hospital, Hengyang Medical School, University of South China Changsha P.R. China
2. Department of Gastrointestinal Surgery The Affiliated Changsha Central Hospital, Hengyang Medical School, University of South China Changsha P.R. China
3. Department of Ultrasound Diagnostics Dongguan Eighth People's Hospital Dongguan P.R. China
4. Department of Pediatric Surgery Dongguan Eighth People's Hospital Dongguan P.R. China