Affiliations

• ¹ Paul Scherrer Institute, Center for Proton Therapy, Villigen, Switzerland.
• ² Department of Physics, ETH Zurich, Zurich, Switzerland.
• ³ Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia.
• ⁴ Danish Center for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark.
• ⁵ Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.
• ⁶ Department of Radiation Oncology, University of California, San Francisco, CA, United States of America.
• ⁷ Jožef Stefan Institute, Ljubljana, Slovenia.
• ⁸ Department of Radiation Oncology, University Hospital Zurich, Zurich, Switzerland.
• ⁹ Department of Radiation Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
• ¹⁰ University of Wisconsin-Madison, Madison, WI, United States of America.