Department of Otolaryngology-Head and Neck Surgery National University Hospital System Singapore Singapore;
Department of Otolaryngology-Head and Neck Surgery National University Hospital System Singapore Singapore;
Department of Otolaryngology Yong Loo Lin School of Medicine National University of Singapore Singapore Singapore;
COVID-19; Adjunctive treatment; Chloroquine; Lopinavir-ritonavir; Remdesivir; Corticosteroids; Umifenovir; Convalescent plasma;