Multicenter diagnostic evaluation of onsite COVID-19 Rapid Test (CTK Biotech) among symptomatic individuals in Brazil and the United Kingdom by Thompson, CR, Torres, PM, Kontogianni, K, Byrne, RL, LSTM Diagnostic group, Noguera, SV, Luna-Muschi, A, Marchi, AP, Andrade, PS, Dos Santos Barboza, A, Nishikawara, M, CONDOR steering group, Body, R, de Vos, M, Escadafal, C, Adams, E, Figueiredo Costa, S, Cubas-Atienzar, AI