title: Comment on "Serum magnesium and not vitamin D is associated with better QoL in COPD: A cross-sectional study".
authors: Research and Education, CIRO, Hornernheide 1, 6085 NM Horn, The Netherlands. Electronic address: ericarutten@ciro-horn.nl.
authors: Erica P A
authors: EP
authors: Rutten
mesh_terms: D002118:Calcium / Q000097:blood*; D005260:Female; D006801:Humans; D008274:Magnesium / Q000097:blood*; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000097:blood*; D014807:Vitamin D / Q000097:blood*
chemical_list: D014807:Vitamin D; D008274:Magnesium; D002118:Calcium