1 Division of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
2 Department of Radiation Oncology, Mayo Clinic, Rochester, MN, USA.
3 Sydney West Radiation Oncology, Crown Princess Mary Cancer Centre, Westmead Hospital, Sydney, New South Wales, Australia.
4 Department of Oncology, Cambridge University Hospitals, Cambridge, UK.
5 Department of Radiation Oncology, Institut Curie, Paris and Orsay, France.
6 Oncology Radiotherapy Institut de Cancérologie de Lorraine, Vandoeuvre les Nancy, France.
7 Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT, USA.
8 Department of Radiation Oncology, Gustave Roussy, Villejuif, France.
9 Department of Radiation Oncology, Centre Léon Bérard, Lyon, France.
10 Institute of Cancer Sciences, University of Glasgow, Glasgow, UK.
11 Department of Radiation Oncology, Keck School of Medicine of USC, Los Angeles, CA, USA.
12 Department of Radiation Oncology, Universität Klinik für Strahlentherapie und Strahlenbiologie, Vienna, Austria.
13 Department of Radiation Oncology, Emory University Winship Cancer Institute, Atlanta, GA, USA.
14 Pediatric Radiotherapy Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy.
15 Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
16 Department of Radiation Oncology, University Hospital Heidelberg, Heidelberg, Germany.
17 Department of Radiation Oncology, University of Florida College of Medicine, Jacksonville, FL, USA.
18 Department of Radiation Oncology, Apollo Proton Cancer Centre, Chennai, Tamil Nadu, India.
19 Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands.
20 Department of Radiotherapy and Radiation Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
21 Department of Radiation Oncology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.
22 Department of Radiation Oncology, Institut Claudius Regaud, Institut Universitaire du Cancer de Toulouse-Oncopole, Toulouse, France.
23 Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, MA, USA.
24 Department of Radiation Oncology, St. Jude Children's Research Hospital, Memphis, TN, USA.
25 Department of Radiation Oncology, Assistance Publique Hôpitaux de Marseille, Marseille, France.
26 Department of Radiation Oncology, Groote Schuur Hospital and University of Cape Town, Cape Town, South Africa.
27 Department of Radiation Oncology, Medical Center Hamburg-Eppendorf, Hamburg, Germany.
28 Department of Radiation Oncology, Massachusetts General Hospital, Boston, MA, USA.
29 Department of Radiation Oncology, McGill University Health Centre, Cedars Cancer Centre, Montréal, Quebec, Canada.
30 Department of Radiation Oncology, New York University Langone School of Medicine, New York, NY, USA.
31 College of Medicine, Swansea University, Swansea, UK.
32 Department of Oncology, The Clatterbridge Cancer Centre, Liverpool, UK.
33 Department of Particle Therapy, University Hospital Essen, West German Proton Therapy Centre Essen, West German Cancer Center, German Cancer Consortium, Essen, Germany.
34 Department of Radiation Oncology and Cancer Imaging, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.
35 Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
36 Department of Radiation Oncology, University of Leipzig, Leipzig, Germany.
37 Division of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. mfmcalee@mdanderson.org.