Schwab P, Dhamane AD, Hopson SD, Moretz C, Annavarapu S, Burslem K, Renda A, Kaila S. Impact of comorbid conditions in COPD patients on health care resource utilization and costs in a predominantly Medicare population. Int J Chron Obstruct Pulmon Dis. 2017 Feb 23;12:735-44. doi: 10.2147/COPD.S112256
Dhamane AD, Schwab P, Hopson S, Moretz C, Annavarapu S, Burslem K, Renda A, Kaila S. Association between adherence to medications for COPD and medications for other chronic conditions in COPD patients. Int J Chron Obstruct Pulmon Dis. 2016 Dec 22;12:115-22. doi: 10.2147/COPD.S114802
Dalal AA, Demuro-Mercon C, Lewis S, Nelson L, Gilligan T, McLeod L. Validation of alternate modes of administration of the lung function questionnaire (LFQ) in subjects with smoking history. Int J Chron Obstruct Pulmon Dis. 2010 Dec 1;5:425-34.