Backwardness in early development and its influencing factors of physical examination for entering kindergartens of children in Jinshui District, Zhengzhou
WANG Jing-jing, XIE Jing, LIU Can, ZHAO Ya, RAN Li-xia
South China Journal of Preventive Medicine . 2022, (1): 7 -10 .  DOI: 10.12183/j.scjpm.2022.0007

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