H. Guimarães, G. Rocha, S. Pissarra, M. B. Guedes, T. Nunes, and B. Vitor, “ Respiratory outcomes and atopy in school-age children who were preterm at birth, with and without bronchopulmonary dysplasia ”, Clinics, vol. 66, no. 3, pp. 425–430, Jan. 2011, doi: 10.1590/S1807-59322011000300011.