[1] Natl Inst Hlth & Med Res, CESP U1018, Villejuif, France
[2] NCI, NIH, DHHS, Div Canc Epidemiol & Genet,Radiat Epidemiol Branc, Bethesda, MD 20892 USA
[3] Inst Curie, Proton Therapy Ctr, Orsay, France
[4] Inst Cancerol Lorraine, Dept Radiotherapy, Vandoeuvre Les Nancy, France
[5] Antoine Lacassagne Ctr, Dept Radiotherapy, Nice, France
[6] Univ Proton Therapy Dresden, Univ Hosp Carl Gustav Carus, Dresden, Germany
[7] Ctr Francois Baclesse, Adv Resource Ctr HADrontherapy, Dept Radiat Oncol, Caen, France
[8] Aarhus Univ Hop, Danish Ctr Particle Therapy, Aarhus, Denmark
[9] Univ Groningen, Univ Med Ctr Groningen, Groningen, Netherlands
[10] Uppsala Univ Hosp, Skand Clin, Uppsala, Sweden
[11] Azienda Prov Serv Sanit, Proton Therapy Ctr, Trento, Italy
[12] Univ Hosp Essen, Clin Particle Therapy, West German Proton Therapy Ctr Essen, West German Canc Ctr, Essen, Germany
[13] Paul Scherrer Inst, Ctr Proton Therapy, Villigen, Switzerland
[14] Univ Florida, Dept Radiat Oncol, Proton Therapy Inst, Jacksonville, FL USA