Marziale, M.H.P., Cassenote, A.J.F., Mininel, V.A., Fracarolli, I.F.L., Santos, H.E.C. dos, Garcia, G.P.A., Robazzi, M.L. do C.C., Rocha, F.L.R., Palha, P.F., Terra, F. de S., Ballestero, J.G. de A., Fortunato, M.A.B. and Lima, M.M. de 2022. Risk of COVID-19 in frontline healthcare workers and interventions: a systematic review. SciELO Preprints.