?:authorAffiliation
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[\'Municipal Centre of Disease Control and Prevention of Qingdao, Qingdao Institute of Prevention Medicine, Qingdao, Shandong Province, China.\', \'Department of Pediatrics, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China.\', \'Qingdao Women and Children\'s Hospital, Qingdao University, Qingdao, Shandong Province, China.\', \'District Center of Disease Control and Prevention of Laoshan, 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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