[1]Fudan Univ, Huashan Hosp, Shanghai, Peoples R China;
[2]Fudan Univ, Zhongshan Hosp, Shanghai, Peoples R China;
[3]Shanghai Jiao Tong Univ, Ruijin Hosp, Shanghai, Peoples R China;
[4]Shanghai Tenth Peoples Hosp, Shanghai, Peoples R China;
[5]Shanghai Jiao Tong Univ, Sch Med, Renji Hosp, Shanghai, Peoples R China;
[6]Univ Chinese Med, Shuguang Hosp, Shanghai, Peoples R China;
[7]Tongji Univ, Shanghai East Hosp, Shanghai, Peoples R China;
[8]Shanghai Changhai Hosp, Shanghai, Peoples R China;
[9]Shanghai Jiao Tong Univ, Sch Med, Shanghai Peoples Hosp 9, Shanghai, Peoples R China;
[10]Shanghai Changzheng Hosp, Shanghai, Peoples R China;
[11]Shanghai Municipal Commiss Hlth & Family Planning, Shanghai, Peoples R China;
[12]Capital Med Univ, Beijing Tiantan Hosp, Beijing, Peoples R China