1. Department of Pathology, Wenling City Chinese Medicine Hospital, Wenling, Zhejiang 317500, P.R. China
2. Key Laboratory of Gastroenterology of Zhejiang Province, Zhejiang Provincial People's Hospital, Hangzhou, Zhejiang 310014, P.R. China
3. Department of Pathology, Zhejiang Provincial People's Hospital, Hangzhou, Zhejiang 310014, P.R. China