1 Department of Gastroenterology, Shanghai Nineth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
2 Division of Gastroenterology and Hepatology, Key Laboratory Gastroenterology and Hepatology, Ministry of Health, State Key Laboratory for Oncogenes and Related Genes, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai Institute of Digestive Disease, Shanghai, China.
3 Department of Gastroenterology, Shanghai Nineth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China. Electronic address: meng_xiangjun@yahoo.com.