1. Department of Pathology, People's Hospital of Putuo District, Zhoushan, Zhejiang 316000, P.R. China
2. Department of Gastroenterology, People's Hospital of Putuo District, Zhoushan, Zhejiang 316000, P.R. China
3. Department of Obstetrics and Gynecology, People's Hospital of Putuo District, Zhoushan, Zhejiang 316000, P.R. China