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, [S. l.], v. 8, n. 1, p. 9–15, 2022. DOI: 10.21801/ppcrj.2022.81.2. Disponível em: https://journal.ppcr.org/index.php/ppcrjournal/article/view/181.. Acesso em: 14 apr. 2025.