Relationship Between Vitamin D Level and Attention Deficit Hyperactivity Disorder：a Meta-analysis　
CHEN Xianrui，HUANG Jianqi，CHEN Ling，WU Jinzhun，XU Jinping
Chinese General Practice . 2020, (35): 4490 -4497 .  DOI: 10.12114/j.issn.1007-9572.2020.00.554

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