Sianesi, Mario, et al. “Use of Axillary Ultrasonography in Breast Cancer: A Useful Tool to Reduce Sentinel Node Procedures”. Annali Italiani Di Chirurgia, vol. 80, no. 4, July 2009, pp. 315-8, https://annaliitalianidichirurgia.it/index.php/aic/article/view/1951.