References
- Buist A, McBurnie M, Vollmer W, et al. International variation in the prevalence of COPD (the BOLD Study): a population-based prevalence study. Lancet. 2007;370:741–750.
- Zamzam MA, Azab NY, El Wahsh RA, et al. Quality of life in COPD patients. Egyptian Journal of Chest Diseases and Tuberculosis. 2012;61(4):281–289. doi:10.1016/j.ejcdt.2012.08.012
- Vaidya T, Chambellan A, de Bisschop C, Sit-to-stand tests for COPD: A literature review. Respir Med. 2017;128:70–77. doi:10.1016/j.rmed.2017.05.003