1. Department of Gastroenterology, Renmin Hospital of Wuhan University , Wuhan, Hubei, P. R. China
2. Department of Psychiatry, Renmin Hospital of Wuhan University , Wuhan, Hubei, P. R. China
3. Department of Clinical Psychology, Beijing Anding Hospital, Capital Medical University , Beijing, P. R. China
4. Department of Medical Psychology, Chinese People’s Liberation Army Rocket Army Characteristic Medical Center , Beijing, P. R. China
5. Department of Gastroenterology, Xijing Hospital, Air Force Medical University , Xi’an, Shaanxi, P. R. China