1. Department of Gastroenterology, Chun’an County First People’s Hospital (Zhejiang Provincial People’s Hospital, Chun’an Branch) , Hangzhou, Zhejiang, P. R. China
2. Key Laboratory of Gastroenterology of Zhejiang Province, Zhejiang Provincial People’s Hospital (Affiliated People’s Hospital, Hangzhou Medical College) , Hangzhou, Zhejiang, P. R. China
3. Department of Gastroenterology, The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Traditional Chinese Medicine) , Hangzhou, Zhejiang, P. R. China