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Correspondence: Krista C. J. Wink, Department of Radiation Oncology (MAASTRO Clinic), Maastricht University Medical Centre, Dr. Tanslaan 12, Maastricht 6229 ET, Netherlands e-mail: krista.wink@maastro.nl
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
© 2014 Wink, Roelofs, Solberg, Lin, Simone_ii, Jakobi, Richter, Lambin and Troost.