1. Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
2. Department of Gastroenterology, Beijing Key Laboratory of Functional Gastrointestinal Disorders Diagnosis and Treatment of Traditional Chinese Medicine, Wangjing Hospital, China Academy of Chinese Medical Sciences, Beijing, China
3. Basic Medical College, Beijing University of Chinese Medicine, Beijing, China
4. Division of Gastroenterology and Hepatology, Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA
5. Cleveland State University, Cleveland, Ohio, USA