1. Department of Pediatrics, Zhangqiu District Maternal and Child Health Care Hospital, Jinan, Shandong 250200, P.R. China
2. Department of Pharmacy, Yantaishan Hospital, Yantai, Shandong 264000, P.R. China
3. Department of Pediatrics, The Affiliated Central Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
4. Department of Medical Laboratory Diagnosis Center, Jinan Central Hospital, Jinan, Shandong 250013, P.R. China