About the Authors

Dirk Wagenaar

d.wagenaar@umcg.nl

Affiliation Department of Radiation Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

Emiel R. van der Graaf

Affiliation KVI-Center for Advanced Radiation Technology, University of Groningen, Groningen, The Netherlands

Arjen van der Schaaf

Affiliation Department of Radiation Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

Marcel J. W. Greuter

Affiliation Department of Radiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DW ERvdG AvdS MJWG. Performed the experiments: DW ERvdG AvdS MJWG. Analyzed the data: DW ERvdG AvdS MJWG. Contributed reagents/materials/analysis tools: DW ERvdG AvdS MJWG. Wrote the paper: DW ERvdG AvdS MJWG.