1 Yun Wang, MD, is Resident Doctor, Department of Gastroenterology, Peking University Ninth School of Clinical Medicine, Beijing, China.
2 Yadan Wang, MD, is Attending Doctor, Department of Gastroenterology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China.
3 Kuiliang Liu, MD, PhD, is Assistant Professor, Department of Gastroenterology, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
4 Jing Wu, MD, PhD, is Professor, Department of Gastroenterology, Peking University Ninth School of Clinical Medicine, Beijing, China; Beijing Shijitan Hospital, Capital Medical University, Yangfangdian, Beijing, China; Department of Gastroenterology, Beijing Friendship Hospital, Capital Medical University, Beijing, China.