1. Department of General Practice, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China
2. Department of Infectious Diseases, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China
3. Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China