Labairu-Huerta, L., Padilla-Fernández, B., Arrondo-Arrondo, J. L., Valverde-Martínez, L. S., Martín-Rodríguez, A., Silva-Abuín, J. M., García-Cenador, M. B., Mirón-Canelo, J. A., & Lorenzo-Gómez, M. F. (2015). PDE-5 inhibitors in monotherapy versus combination therapy in a sample of 1200 patients with erectile dysfunction. Archivio Italiano Di Urologia E Andrologia, 87(3), 204–209. https://doi.org/10.4081/aiua.2015.3.204