1. Department of Gastrointestinal Surgery, Xi’an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi’an, Shanxi, P.R. China
2. Department of Pediatrics, Xi’an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi’an, Shanxi, P.R. China
3. Department of Obstetrics and Gynecology, Xi’an No. 3 Hospital, The Affiliated Hospital of Northwest University, Xi’an, Shanxi, P.R. China
4. Department of Dermatology, Cangzhou Central Hospital, No. 16 Xinhua Western Road, Cangzhou, Hebei, P.R. China