[1] Mem Sloan Kettering Canc Ctr, Dept Med Phys, New York, NY 10021 USA
[2] UC Davis Med Ctr, Dept Radiat Oncol, Sacramento, CA USA
[3] Mayo Clin, Dept Radiat Oncol, Rochester, MN USA
[4] Princeton Radiat Oncol, Radiat Oncol, Monroe, NJ USA
[5] Louis Stokes VA Med Ctr, Radiat Therapy Dept, Cleveland, OH USA
[6] Univ Utah, Radiat Oncol, Salt Lake City, UT USA
[7] Univ Calif San Diego, Radiat Med & Appl Sci, La Jolla, CA 92093 USA
[8] Swedish Med Ctr, Radiat Oncol, Seattle, WA USA
[9] Banner MD Anderson Canc Ctr, Gilbert, AZ USA
[10] Univ Iowa, Dept Radiat Oncol, Iowa City, IA USA
[11] Univ Michigan, Dept Radiat Oncol, Ann Arbor, MI 48109 USA
[12] Mayo Clin, Secur Operat Ctr, Rochester, MN USA