Reply to: Sentinel node biopsy after neoadjuvant chemotherapy for breast cancer in patients with pre-treatment node-positive: Recommendation to optimize the performance. Issue 1 (January 2020) - Simons, J.M.; Maaskant-Braat, A.J.G.; Luiten, E.J.T.; Leidenius, M.H.; van Nijnatten, T.J.A.; Boelens, P.G.; Koppert, L.B.; van der Pol, C.C.; van de Velde, C.J.H.; Audisio, R.A.; Smidt, M.L.