1. Gastroenterology Department, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
2. Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
3. Department of Physical Education and Human Performance, Central Connecticut State University, New Britain, CT, USA
4. Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH, USA