The need for fast-track, high-quality and low-cost studies about the role of the BCG vaccine in the fight against COVID-19 oleh Marcos Pereira, Enny Paixão, Anete Trajman, Ramon Andrade de Souza, Marcio Santos da Natividade, Julia M. Pescarini, Susan Martins Pereira, Florisneide Rodrigues Barreto, Ricardo Ximenes, Margareth Dalcomo, Maria Yury Ichihara, Ceuci Nunes, Manoel Barral-Netto, Maurício L. Barreto