Salvador, P., C. Lombo, F. M. da Silva, and R. Fonseca. “Chronic Rhinosinusitis With Nasal Polyps: Predictive Factors for Recurrence and Revision Surgery”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 6, no. 12, Nov. 2020, pp. 2165-72, doi:10.18203/issn.2454-5929.ijohns20205054.