The Association of Serum Vitamin D Levels with Lung Function, Symptom Severity, and Exacerbations in Stable COPD Patients. Asian Journal of Public Health and Nursing, [S. l.], v. 1, n. 2, p. 32–39, 2024. DOI: 10.62377/drshg005. Disponível em: https://ajphn.qvjournal.com/index.php/about/article/view/19.. Acesso em: 18 sep. 2025.