Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data.
['Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data.', 'Annual high-dose oral vitamin D and falls and fractures in older women: a randomized controlled trial.', 'Iwona Stelmach', 'The BMJ', 'Creative Commons Attribution', 'Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data.']