Vitamin D Supplementation for Childhood Asthma: A Systematic Review and MetaAnalysis
PLOS ONE
Bruno D. Riverin 1,2, Jonathon L. Maguire 3,4,5 Patricia Li 1,2 patricia.li at mcgill.ca
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See also Vitamin D Life
Overview Asthma and Vitamin D
Asthma reduced 60 percent with vitamin D supplementation – meta-analysis 2014, 2015
Thus 2 other meta-analysis disagree with study on this page