Alves, M. R., R. A. G. de Souza, and R. dos S. Caló. “Poor Sanitation and Transmission of COVID-19 in Brazil”. São Paulo Medical Journal, vol. 139, no. 1, Feb. 2021, pp. 72-76, https://periodicosapm.emnuvens.com.br/spmj/article/view/380.