[1] Beijing Ctr Dis Prevent & Control, Inst Immunizat & Prevent, Beijing Res Ctr Prevent Med, Beijing, Peoples R China
[2] China Guinea Friendship Hosp, Dept Emergency, Conakry, Guinea
[3] Capital Med Univ, Xuanwu Hosp, Dept Cardiol, Beijing, Peoples R China
[4] Capital Med Univ, Xuanwu Hosp, Dept Finance, Beijing, Peoples R China
[5] Capital Med Univ, Xuanwu Hosp, Dept Pharm, Beijing, Peoples R China
[6] Beijing Municipal Hlth Commiss, Off Med Affairs, Beijing, Peoples R China