Pereira, K., J. Monteiro, A. Neto, M. Rodrigues, T. Serra, L. Khouri, S. Gonçalves, and P. Alves. “The Impact of Covid-19 Pandemic in the Treatment of Head and Neck Cancer: A Semi-Annual Analysis”. Portuguese Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 59, no. 2, June 2021, pp. 207-15, doi:10.34631/sporl.930.