?:authorAffiliation
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[\'Municipal Centre of Disease Control and Prevention of Qingdao, Qingdao Institute of Prevention Medicine, Qingdao, Shandong Province, China.\', \'Qingdao Women and Children\'s Hospital, Qingdao University, Qingdao, Shandong Province, China.\', \'Qingdao Chest Hospital, Qingdao, Shandong Province, China.\', \'Municipal Centre of Disease Control and Prevention of Qingdao, Qingdao Institute of Prevention Medicine, Qingdao, Shandong Province, China. Electronic address: ruqingao123@sina.com.\', \'Municipal Centre of Disease Control and Prevention of Qingdao, Qingdao Institute of Prevention Medicine, Qingdao, Shandong Province, China. Electronic address: 13583206500@163.com.\']
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