External validation of a prognostic model based on total tumor load of sentinel lymph node for early breast cancer patients - Piñero-Madrona A; Ripoll-Orts F; Sánchez-Méndez JI; Chaves-Benito A; Gómez-de la Bárcena MR; Calatrava-Fons A; Menjón-Beltrán S; Peg-Cámara V (Breast Cancer Research And Treatment, 2020)