[1] Yantai Yuhuangding Hosp, Dept Resp Med, Yantai 264000, Peoples R China
[2] Yantai Municipal Inst Drug Control, Dept Antibiot Control, Yantai 264000, Peoples R China
[3] Chinese Acad Med Sci, Peking Union Med Coll Hosp, Dept Resp Med, Beijing 100730, Peoples R China
[4] Chinese Acad Med Sci, Peking Union Med Coll, Inst Canc, Dept Chem Aetiol & Carcinogenesis, Beijing 100021, Peoples R China