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