1. Department of Surgery, Center of Gastrointestinal Rehabilitation, Beijing Rehabilitation Hospital, Capital Medical University, Beijing 100144, P.R. China
2. Department of Gastroenterology and Hepatology, Center of Gastrointestinal Rehabilitation, Beijing Rehabilitation Hospital, Capital Medical University, Beijing 100144, P.R. China
3. Department of Acute Medicine, Queen Elizabeth Hospital, London SE18 4QH, UK
4. Department of Cancer Genetics and Epigenetics, Beckman Research Institute of The City of Hope, Duarte, CA 91010, USA