The impact of the COVID-19 pandemic on the management of head and neck cancer patients at a tertiary care institution in Poland - Szewczyk, Mateusz; Pazdrowski, Jakub; Golusiński, Paweł; Pazdrowski, Paweł; Więckowska, Barbara; Golusiński, Wojciech (Contemporary Oncology/Współczesna Onkologia, 2021)