1. Department of Infectious Diseases, Institute for Viral Hepatitis, Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
2. Department of Gynecology and Obstetrics, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China