Relation Of Serum Theophylline Concentration And Slow Release Theophylline Dosage In Patients With COPD . Annals of Medical Research, [S. l.], v. 7, n. 3, p. 0230–0233, 2021. Disponível em: http://annalsmedres.org/index.php/aomr/article/view/2799. Acesso em: 15 oct. 2025.