Recommendations for head and neck surgical oncology practice in a setting of acute severe resource constraint during the COVID-19 pandemic: an international consensus - Mehanna, Hisham; Hardman, John C; Shenson, Jared A; Abou-foul, Ahmad K; Topf, Michael C; Alfalasi, Mohammad; Chan, Jason Y. K; Chaturvedi, Pankaj; Chow, Velda Ling Yu; Kowalski, Luiz Paulo (Lancet oncology, 2020)