Vitamin D and skeletal muscle strength and endurance in COPD
Abigail S. Jackson, Dinesh Shrikrishna, Julia L. Kelly, Nicholas Hart, John Moxham, Michael I. Polkey, Paul Kemp, Nicholas S. Hopkinson
European Respiratory Journal Feb 2013, 41 (2) 309-316; DOI: 10.1183/09031936.00043112