Atallah Álvaro N. Systematic reviews followed by clinical trials, followed by systematic reviews: this is how the uncertainties in medicine are reduced. Sao Paulo Med J [Internet]. 2007 Mar. 3 [cited 2025 Mar. 9];125(2):71-2. Available from: https://periodicosapm.emnuvens.com.br/spmj/article/view/2066