[1] Capital Med Univ, Beijing Chao Yang Hosp, Dept Infect Dis & Clin Microbiol, Beijing, Peoples R China
[2] Peking Univ, Med Coll 4, Dept Infect Dis, Beijing Jishuitan Hosp, Beijing, Peoples R China
[3] China Japan Friendship Hosp, Dept Pulm & Crit Care Med, Ctr Resp Dis, Natl Clin Res Ctr Resp Dis, Beijing, Peoples R China
[4] Kunming Med Univ, Yanan Hosp, Dept Resp Med, Kunming, Yunnan, Peoples R China
[5] Qingdao Municipal Hosp, Dept Resp Med, Qingdao, Peoples R China
[6] Beijing Huimin Hosp, Dept Resp Med, Beijing, Peoples R China
[7] Linzi Dist Peoples Hosp, Dept Resp Med, Zibo, Peoples R China
[8] Capital Med Univ, Beijing Luhe Hosp, Dept Resp Med, Weifang, Peoples R China
[9] Weifang 2 Peoples Hosp, Dept Pulm & Crit Care Med, Weifang, Peoples R China
[10] Shandong Univ Qindao, Dept Resp Med, Qilu Hosp, Qingdao, Peoples R China
[11] Chinese Armed Police Forces, Hosp Beijing Corps 2, Dept Resp Med, Beijing, Peoples R China
[12] Yantai Yuhuangding Hosp, Dept Infect Dis, Yantai, Peoples R China
[13] Shandong Chinese Med Univ, Rizhao Chinese Med Hosp, Dept Resp Med, Rizhao, Peoples R China
[14] Capital Med Univ, Beijing Chao Yang Hosp, Occupat Med & Toxicol Dept, Beijing, Peoples R China
[15] Ctr Dis Control & Prevent, Influenza Div, Natl Ctr Immunizat & Resp Dis, Atlanta, GA USA
[16] Capital Med Univ, Dept Pulm Med, Beijing, Peoples R China