Tvedskov, Tove F., et al. “Robust and Validated Models to Predict High Risk of Non-Sentinel Node Metastases in Breast Cancer Patients With Micrometastases or Isolated Tumor Cells in the Sentinel Node”. Acta Oncologica, vol. 53, no. 2, Feb. 2014, pp. 209-15, doi:10.3109/0284186X.2013.806993.