P. Giavina-Bianchi, M. V. Aun, C. Bisaccioni, R. Agondi, and J. Kalil, “ Difficult-to-control asthma management through the use of a specific protocol ”, Clinics, vol. 65, no. 9, pp. 905–918, Jan. 2010, doi: 10.1590/S1807-59322010000900014.