[Ping, Zhou; Di, Xue] Fudan Univ, Sch Publ Hlth, Dept Hosp Management, Shanghai, Peoples R China; [Shi Jian-wei] Tongji Univ, Sch Med, Shanghai, Peoples R China; [Yu, Zhang] Hlth & Family Planning Commiss Hubei Prov, Beijing, Hubei, Peoples R China; [Wei Xue-feng] Hlth & Family Planning Commiss Gansu Prov, Beijing, Gansu, Peoples R China