[1] Cent S Univ, Sch Publ Hlth, Changsha 410083, Peoples R China
[2] Cent S Univ, Xiangya Hosp, Dept Infect Dis, Changsha 410083, Peoples R China
[3] Cent S Univ, Changde Hosp, Dept Surg, Changsha 410083, Peoples R China
[4] Publ Hlth Agcy Canada, CIDPC, Blood Safety Surveillance Div, Ottawa, ON, Canada
[5] Univ Ottawa, Dept Obstet & Gynecol, OMNI Res Grp, Ottawa, ON K1H 8L6, Canada
[6] Clin Epidemiol Program, Ottawa Hlth Res Inst, Ottawa, ON, Canada
[7] Univ Ottawa, Dept Epidemiol & Community Hlth, Ottawa, ON, Canada