1. Office of Hospital Infection Management, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261031, P.R. China
2. Department of Child Rehabilitation, Zaozhuang Maternal and Child Health Hospital of Shandong Province, Zaozhuang, Shandong 277100, P.R. China
3. Department of Child Rehabilitation, The Second People's Hospital of Liaocheng, Liaocheng, Shandong 252600, P.R. China
4. Department of Pharmacy, Yidu Central Hospital, Weifang, Shandong 262500, P.R. China
5. Department of Paediatrics, Haiyang People's Hospital of Shandong Province, Haiyang, Shandong 265100, P.R. China
6. Department of Pediatrics, Laoling People's Hospital, Laoling, Shandong 253600, P.R. China