[1] Aarhus Univ, Med Clin, Aarhus N, Denmark
[2] Aarhus Univ Hosp, Danish Ctr Particle Therapy, Aarhus N, Denmark
[3] Univ Med Ctr Groningen, Dept Radiat Oncol, Groningen, Netherlands
[4] Inst Curie, Dept Radiat Oncol, Paris, France
[5] Inst Curie, Proton Ctr, Paris, France
[6] Clin Univ Navarra, Proton Therapy Unit, Madrid, Spain
[7] Proton Therapy Ctr Quironsalud, Dept Radiat Oncol, Madrid, Spain
[8] Univ Manchester, Manchester Acad, Christie NHS Fdn Trust, Hlth Sci Ctr, Manchester, England
[9] Ctr Reg Francois Baclesse, Dept Radiat Oncol, Caen, France
[10] Ctr Antoine Lacassagne, Dept Radiat Oncol, Nice, France
[11] Natl Res Inst Oncol Krakow, Dept Radiat Oncol, Gliwice Branch, Krakow, Poland
[12] Karolinska Univ Hosp, Dept Radiotherapy, Stockholm, Sweden
[13] Skane Univ Hosp, Hematol Oncol & Radiat Phys, Lund, Sweden
[14] Particle UZ Leuven, Dept Radiat Oncol, Leuven, Belgium
[15] Univ Heidelberg Hosp, Dept Radiat Oncol, Heidelberg Ion Beam Therapy Ctr, Heidelberg, Germany
[16] Polish Acad Sci, Inst Nucl Phys, Krakow, Poland
[17] MedAustron Ion Therapy Ctr, Dept Radiat Oncol, Wiener Neustadt, Austria
[18] Ctr Proton Therapy, Paul Scherrer Inst, Villigen, Switzerland
[19] CNAO Natl Ctr Oncol Hadrontherapy, Dept Radiat Oncol, Pavia, Italy
[20] Proton Therapy Ctr Czech, Dept Radiat Oncol, Prague, Czech Republic
[21] Sahlgrens Univ Hosp, Dept Therapeut Radiat Phys, Med Phys & Biomed Engn, Gothenburg, Sweden
[22] Univ Gothenburg, Sahlgrenska Acad, Dept Med Radiat Sci, Inst Clin Sci, Gothenburg, Sweden
[23] Univ Hosp Essen, Dept Particle Therapy, West German Proton Therapy Ctr Essen WPE, West German Canc Ctr WTZ, Essen, Germany
[24] Hosp S Chiara, Med Phys Unit, APSS, Trento, Italy
[25] Trento Proton Therapy Ctr, Dept Radiat Oncol, Trento, Italy
[26] Univ Hosp Essen, Dept Particle Therapy, West German Proton Therapy Ctr Essen WPE, West German Canc Ctr WTZ,German Canc Consortium D, Essen, Germany
[27] Fdn IRCCS Ist Nazl Tumor, Dept Therapy, Pediat Radiotherapy Unit, Milan, Italy
[28] Univ Manchester, Royal Manchester Childrens Hosp, Childrens Brain Tumour Res Network, Manchester, England
[29] Karolinska Univ Hosp, Dept Radiotherapy Phys & Engn, Stockholm, Sweden