1. State Key Laboratory for Diagnosis and Treatment of Infectious Diseases The First Affiliated Hospital School of Medicine Zhejiang University Hangzhou Zhejiang 310003 P. R. China
2. Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases Hangzhou Zhejiang 310003 P. R. China
3. Department of Hepatobiliary and Pancreatic Surgery The First Affiliated Hospital School of Medicine Zhejiang University Hangzhou Zhejiang 310003 P. R. China