[1] Miami Canc Inst, Dept Radiat Oncol, Baptist Hlth South Florida, Miami, FL USA
[2] Northwestern Med Canc Ctr Warrenville, Chicago, IL USA
[3] Northwestern Med Proton Ctr, Chicago, IL USA
[4] Univ Washington, Seattle, WA USA
[5] Oklahoma Proton Ctr, Oklahoma City, OK USA
[6] Willis Knighton Proton Therapy Ctr, Shreveport, LA USA
[7] New York Proton Ctr, New York, NY USA
[8] Mayo Clin Arizona, Phoenix, AZ USA
[9] ProCure Proton Therapy Ctr, Somerset, IL USA