Risk of positive sentinel lymph node after neoadjuvant systemic therapy in clinically node negative breast cancer -implications for postmastectomy radiation therapy and immediate breast reconstruction. Issue 2 (February 2020) - Samiei, Sanaz; van Kaathoven, Babbe; Boersma, Liesbeth; Granzier, Renée; Sabine, Siesling; Engelen, Sanne; de Munck, Linda; van Kuijk, Sander; van der Hulst, René; Lobbes, Marc; van Nijnatten, Thiemo; Smidt, Marjolein