Effects of daily vitamin D supplementation on respiratory muscle strength and physical performance in vitamin D-deficient COPD patients: a pilot trial

Rachida Rafiq, Hendrik Prins, Wim Boersma, Johannes Daniels, Martin den Heijer, Paul Lips, Renate de Jongh
  • International Journal of Chronic Obstructive Pulmonary Disease, August 2017, Dove Medical Press
  • DOI: 10.2147/copd.s132117

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