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Severe Vitamin D Deficiency: A Prerequisite for Chronic Obstructive Pulmonary Disease Responsiveness to Vitamin D Supplementation?
Diane R. Gold, MD, MPH; JoAnn E. Manson, MD, DrPH
Annals of Internal Medicine 2012;156:904-905.
doi:10.7326/0003-4819-156-12-201206190-00023
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