Risk factors for severe COVID-19 infection in Brazilian children Jordana Vaz Hendler; Patricia Miranda do Lago; Gabriel Cardozo Müller; João Carlos Santana; Jefferson Pedro Piva; Liane Esteves Daudt;

Navigating the waves in Colombia: a cohort study of inpatient care during four COVID-19 waves David E. Rebellón-Sánchez; Tania M. Guzmán; Sarita Rodriguez; Julio Llanos-Torres; Daniela Vinueza; Eric Tafurt; Estefanía Beltrán; Álvaro Martínez; Fernando Rosso;

Fully independent validation of eleven prognostic scores predicting progression to critically ill condition in hospitalized patients with COVID-19 Vinicius Lins Costa Mello; Pedro Emmanuel Alvarenga Americano do Basil;