“Effects of home air purifiers in the quality of life of patients with chronic obstructive pulmonary disease in Mexico City: : a phase III, single-center, triple-blinded, randomized controlled trial (GREAT-COPD)”., PPCR, vol. 8, no. 1, pp. 9–15, Apr. 2022, doi: 10.21801/ppcrj.2022.81.2.