Comorbidities and risk of mortality in patients with chronic obstructive pulmonary disease.
Am J Respir Crit Care Med. 2012 Jul 15;186(2):155-61. doi: 10.1164/rccm.201201-0034OC. Epub 2012 May 3.
Am J Respir Crit Care Med. 2012.
PMID: 22561964