“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)”. Principles and Practice of Clinical Research, vol. 8, no. 1, Apr. 2022, pp. 9-15, https://doi.org/10.21801/ppcrj.2022.81.2.