Martimbianco, A. L. C., Pacheco, R. L., Latorraca, C. de O. C., Ferreira, R. E. S. and Riera, R. (2021) “Systematic reviews on interventions for COVID-19 have rarely graded the certainty of the evidence”, São Paulo Medical Journal, 139(5), pp. 511–513. Available at: https://periodicosapm.emnuvens.com.br/spmj/article/view/523 (Accessed: 16 October 2025).