1. Department of Gastroenterology, Yuyao People's Hospital of Zhejiang Province, Yuyao, Zhejiang 315400, P.R. China
2. Department of Gastroenterology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
3. Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310000, P.R. China
4. Department of Anesthesiology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China