Exacerbation of COPD in elderly people admitted to a University Hospital in West Paraná. Research, Society and Development, [S. l.], v. 13, n. 2, p. e6213245064, 2024. DOI: 10.33448/rsd-v13i2.45064. Disponível em: https://rsdjournal.org/rsd/article/view/45064. Acesso em: 5 dec. 2025.