Journal of Hebei Medical University ›› 2022, Vol. 43 ›› Issue (5): 574-577.doi: 10.3969/j.issn.1007-3205.2022.05.015
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1.Department of Pediatrics, Qingdao Municipal Hospital, Shandong Province, Qingdao 266000, China;
2.Department of Pediatrics, the People′s Hospital of Qingdao West Coast New Area, Shandong Province, Qingdao 266000, China