Study on vitamin D level of 603 adolescent children in Harbin
LI Qiu-shi, LI Shu-wei, LI Dan, LIU Yang-yang, WANG Di, YANG Shu-fen
Chinese Journal of Child Health Care . 2021, (10): 1120 -1124 .  DOI: 10.11852/zgetbjzz2021-0027