Global initiative for chronic Obstructive Lung Disease (GOLD 2017). Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease. Available from: http://goldcopd.org/.
Eisner MD, Iribarren C, Yelin EH, et al. Pulmonary function and the risk of functional limitation in chronic obstructive pulmonary disease. Am J Epidemiol 2008;167:1090–1101.
ZuWallack R. How are you doing? What are you doing? Differing perspectives in the assessment of individuals with COPD. COPD 2007;4:293–7.
Partridge MR, Karlsson N, Small IR. Patient insight into the impact of chronic obstructive pulmonary disease in the morning: an internet survey. Curr Med Res Opin 2009;25:2043–2048.
Partridge MR et al. Curr Med Res Opin 2012;28:1405. [Erratum].
Kuyucu T, Guclu SZ, Saylan B, et al. A cross-sectional observational study to investigate daily symptom variability, effects of symptom on morning activities and therapeutic expectations of patients and physicians in COPD-SUNRISE study. Tuberk Toraks 2011;59:328–339.
Tsiligianni IG, van der Molen T, Moraitaki D, et al. Assessing health status in COPD. A head-to-head comparison between the COPD assessment test (CAT) and the clinical COPD questionnaire (CCQ). BMC Pulm Med 2012;12:20.
Westwood M, Bourbeau J, Jones PW, et al. Relationship between FEV1 change and patient-reported outcomes in randomised trials of inhaled bronchodilators for stable COPD: a systematic review. Respir Res 2011;12:40.