1. West German Proton Therapy Centre (WPE) Essen Germany
2. University Hospital Essen Essen Germany
3. West German Cancer Centre (WTZ) Essen Germany
4. Department of Ophthalmology Charité—Universitätsmedizin Berlin Berlin Germany
5. Charité—Universitätsmedizin Berlin, BerlinProtonen am Helmholtz‐Zentrum Berlin für Materialien und Energie Berlin Germany
6. RaySearch Laboratories Stockholm Sweden
7. Department of Physics TU Dortmund University Dortmund Germany
8. German Cancer Consortium (DKTK) Essen Germany
9. Department of Ophthalmology University Hospital Essen Essen Germany
10. Department of Particle Therapy University Hospital Essen Essen Germany