[1] Department of Internal Medicine, First Clinical College, Nanjing Traditional Chinese Med. U., Nanjing 210029, China
[2] Department of Pathology, Shanghai Medical College, Fudan University, Shanghai 200032, China
[3] Department of Gastroenterology, Huashan Hospital, Fudan University, Shanghai 200040, China
[4] Department of Gastroenterology, Second People Hospital, Luohe, Henan Province, Luohe 462000, China