1 Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan. Electronic address: matrosic@med.umich.edu.
2 MedAustron Ion Therapy Center, Wiener Neustadt, Austria.
3 Department of Radiation Oncology, University of British Columbia, BC Cancer-Vancouver, Vancouver, British Columbia, Canada.
4 Department of Medical Physics, University of British Columbia, BC Cancer-Prince George, Prince George, British Columbia, Canada.
5 Machine Learning Department, Moffitt Cancer Center, Tampa, Florida.
6 Brainlab AG, Munich, Germany.
7 Department of Oncology, Aarhus University Hospital, Aarhus, Denmark.
8 Department of Radiation Oncology, University of Toronto, Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.
9 Department of Human Oncology, University of Wisconsin, Madison, Wisconsin.
10 St Luke's Radiation Oncology Network, Dublin, Ireland.
11 Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York.
12 New York Proton Center, New York, New York.
13 Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan.
14 Department of Oncology, Western University, London, Ontario, Canada; London Health Sciences Centre, London, Ontario, Canada.
15 RaySearch Laboratories AB, Stockholm, Sweden.
16 Varian Medical Systems, Palo Alto, California.
17 Division of Cancer Sciences, The University of Manchester, Manchester, United Kingdom.
18 Northern Centre for Cancer Care, Newcastle upon Tyne Hospitals Trust, Newcastle upon Tyne, United Kingdom.
19 Leeds Institute of Medical Research at St James's, University of Leeds, Leeds, United Kingdom.