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China Japan Friendship Hosp, Ctr Resp Med, Dept Pulm & Crit Care Med, 2 East Yinghua Rd, Beijing 100029, Peoples R China
Chinese Acad Med Sci, Peking Union Med Coll, Grad Sch, 9 Dongdan Santao, Beijing 100730, Peoples R China
Natl Ctr Resp Med, 2 East Yinghua Rd, Beijing 100029, Peoples R China
Chinese Acad Med Sci, Inst Resp Med, 2 East Yinghua Rd, Beijing 100029, Peoples R China
Natl Clin Res Ctr Resp Dis, 2 East Yinghua Rd, Beijing 100029, Peoples R China
WHO Collaborating Ctr Tobacco Cessat & Resp Dis P, 2 East Yinghua Rd, Beijing 100029, Peoples R China China Japan Friendship Hosp, Ctr Resp Med, Dept Pulm & Crit Care Med, 2 East Yinghua Rd, Beijing 100029, Peoples R China