Development and validation of nomograms for predicting axillary non-SLN metastases in breast cancer patients with 1-2 positive sentinel lymph node macro-metastases: a retrospective analysis of two independent cohorts. - Yu, Yang; Wang, Zhijun; Wei, Zhongyin; Yu, Bofan; Shen, Peng; Yan, Yuan; You, Wei (BMC Cancer, 2021)