1 Department of Radiation Oncology (Maastro), GROW School for Oncology,and Reproduction, Maastricht University Medical Centre+, Maastricht, The Netherlands; Breast Radiation Unit, Sheba Medical Center, Ramat Gan, Israel; School of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
2 Department of Radiation Oncology, University Hospital Erlangen, Comprehensive Cancer Center Erlangen-EMN, Germany.
3 Division of Radiation Oncology, Institute of Oncology Ljubljana, Ljubljana, Slovenia and Medical Faculty, University of Ljubljana, Slovenia.
4 Department of Radiation Oncology (Maastro), GROW School for Oncology,and Reproduction, Maastricht University Medical Centre+, Maastricht, The Netherlands.
5 Department of Radiation Oncology, Iridium Netwerk, Wilrijk-Antwerp, Belgium; University of Antwerp, Faculty of Medicine and Health Sciences, Wilrijk-Antwerp, Belgium. Electronic address: Philip.poortmans@telenet.be.