2308-05312308-0531S2308-0531202100030064510.25176/rfmh.v21i3.3921PeruPerúPerúPerú0007202100072021213645652201814222347-56201517102102200512196-202200910115151058-652017961616198471711-4200228388-912005235534-4120008812122739-502017844105-92020Early Breast Cancer Trialists' Collaborative Group20053651687201637520201925-36