1. Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang university, Hangzhou, Zhejiang 310003, P.R. China
2. State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Zhejiang university School of Medicine, Hangzhou, Zhejiang 310003, P.R. China
3. Key Laboratory of Tumor Molecular Diagnosis and Individualized Medicine of Zhejiang Province, Key Laboratory of Gastroenterology of Zhejiang Province, Zhejiang Provincial People's Hospital, Hangzhou, Zhejiang 310014, P.R. China
4. Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, Guangdong 518103, P.R. China