[1] Mayo Clin, Dept Radiat Oncol, Rochester, MN 55905 USA
[2] New York Proton Ctr, Dept Radiat Oncol, New York, NY USA
[3] Mem Sloan Kettering Canc Ctr, 1275 York Ave, New York, NY 10021 USA
[4] Massachusetts Gen Hosp, Dept Radiat Oncol, Boston, MA 02114 USA
[5] Inst Curie, Dept Radiat Oncol, Paris, France
[6] Miami Canc Inst, Dept Radiat Oncol, Miami, FL USA
[7] Rutgers Canc Inst New Jersey, Dept Radiat Oncol, New Brunswick, NJ USA
[8] UCL, Dept Med Phys & Biomed Engn, Proton & Adv Radiotherapy Grp, London, England
[9] Univ Florida, Dept Radiat Oncol, Jacksonville, FL USA
[10] Beaumont Hlth, Dept Radiat Oncol, Royal Oak, MI USA
[11] Northwestern Med Proton Ctr, Dept Radiat Oncol, Warrenville, IL USA
[12] Univ Florida, Dept Radiat Oncol, Jacksonville, FL USA
[13] Skand Clin, Uppsala, Denmark
[14] Danish Ctr Particle Therapy, Aarhus, Denmark
[15] Mayo Clin Hosp, Dept Radiat Oncol, Phoenix, AZ USA
[16] UC San Diego Hlth, Dept Radiat Med & Appl Sci, Encinitas, CA USA
[17] Mem Sloan Kettering Canc Ctr, Dept Radiat Oncol, New York, NY USA
[18] Univ Groningen, Univ Med Ctr Groningen, Dept Radiat Oncol, Groningen, Netherlands