1 1Department of Psychological Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100730 People's Republic of China.
2 2Department of Psychosomatic Medicine and Psychotherapy, University Medical Centre Freiburg, Freiburg, Germany.
3 3Institute of Psychology, University of Freiburg, Freiburg, Germany.
4 4Department of Gastroenterology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
5 5Department of Traditional Chinese Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
6 6Department of Psychosomatic Medicine, Dongfang Hospital, School of Medicine, Tongji University, Shanghai, China.
7 7Mental Health Centre, West China Hospital, Sichuan University, Chengdu, Sichuan China.
8 8Department of Psychosomatics, Medical Division, University Hospital Basel, Basel, Switzerland.