Impact of the COVID-19 Pandemic on Brazilian Head and Neck Surgery Centers - Alvarenga, Gustavo Fernandes de; Leite, Ana Kober Nogeira; Lehn, Carlos Neutzling; Dedivitis, Rogério Aparecido; Nakai, Marianne Yumi; Cavalheiro, Beatriz Godoi; Teixeira, Gilberto Vaz; Cicco, Rafael de; Kowalski, Luiz Paulo; Matos, Leandro Luongo (Brazilian journal of otorhinolaryngology, 2023)