References
- Jones PW. Activity Limitation and Quality of life In COPD. COPD: Journal of Chronic Obstructive Pulmonary Disease. 2007;4(3):273–278. doi:10.1080/15412550701480265
- American Thoracic Society; American College of Chest Physicians. ATS/ACCP statement on cardiopulmonary exercise testing. Am J Respir Crit Care Med. 2003;167(2):211–277.
- Spruit MA, Polkey MI, Celli B, et al. Predicting outcomes from 6-minute walk distance in chronic obstructive pulmonary disease. J Am Med Dir Assoc. 2012;13(3):291–297. doi:10.1016/j.jamda.2011.06.009