1. Department of Gastroenterology, The Affiliated Lihuili Hospital, Ningbo University , Ningbo , Zhejiang 315040 , P.R. China
2. Department of Gastroenterology, Cixi People’s Hospital , Cixi , Zhejiang 315300 , P.R. China
3. School of Medicine, Ningbo University , Ningbo , Zhejiang 315040 , P.R. China
4. Physical Examination Center, The Affiliated Lihuili Hospital, Ningbo University , Ningbo , Zhejiang 315040 , P.R. China
5. Department of Preventation and Care, The Affiliated Lihuili Hospital, Ningbo University , Ningbo , Zhejiang 315040 , P.R. China
6. Department of Hepatobiliary Surgery, The Affiliated Lihuili Hospital, Ningbo University , Ningbo , Zhejiang, 315040 , P.R. China