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China Japan Friendship Hosp, Dept Pulm & Crit Care Med, Ctr Resp Med, Beijing, Peoples R China
Chinese Acad Med Sci, Inst Resp Med, Beijing, Peoples R China
Natl Clin Res Ctr Resp Dis, Beijing, Peoples R China
Chinese Acad Med Sci, Peking Union Med, Beijing, Peoples R China
WHO Collaborat Ctr Tobacco Cessat & Resp Dis Prev, Beijing, Peoples R China Ohio State Univ, Div Cardiovasc Med, Wexner Med Ctr, 473 W 12th Ave,Suite 200, Columbus, OH 43210 USA