Vitamin D for prevention of respiratory tract infections: A systematic review and meta-analysis.
Charan, Jaykaran; Goyal, Jagdish P.; Saxena, Deepak; Yadav, Preeti; Journal of Pharmacology & Pharmacotherapeutics, 2012, vol. 3, issue 4, p 300, ISSN 0976500X. ISBN 0976500X.
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