Vitamin D supplement use and influencing factors among primary and secondary school students in Guangzhou, 2016
LIU Yi-yang，DENG Jia-ru，YANG Shu-yi，AO Li-ping，LI Bang-hai，LIU Li.
S China J Prev Med . 2018, (6): 528 -532 .  DOI: 10.13217/j.scjpm.2018.0528

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