1 Department of Radiation Oncology, Iridium Kankernetwerk, Wilrijk-Antwerp, Belgium; Faculty of Medicine and Health Sciences, University of Antwerp, Wilrijk-Antwerp 2610, Belgium. Electronic address: philip.poortmans@telenet.be.
2 Department of Surgery, Oncology and Gastroenterology, University of Padova, Italy; Medical Oncology 2, Istituto Oncologico Veneto IRCCS, Padova, Italy.
3 Breast Unit, Champalimaud Clinical Centre, Champalimaud Foundation, Lisbon, Portugal; Nova Medical School, University of Lisbon, Lisbon, Portugal.