Maintenance after pulmonary rehabilitation in chronic lung disease: a randomized trial.
Am J Respir Crit Care Med. 2003 Mar 15;167(6):880-8. doi: 10.1164/rccm.200204-318OC. Epub 2002 Dec 27.
Am J Respir Crit Care Med. 2003.
PMID: 12505859
Clinical Trial.