[1] Wake Forest Baptist Med Ctr, Dept Radiat Oncol, Winston Salem, NC USA
[2] Stanford Univ, Dept Radiat Oncol, Stanford, CA 94305 USA
[3] Univ Washington, Dept Radiat Oncol, Seattle, WA 98195 USA
[4] Mayo Clin, Dept Radiat Oncol, Rochester, MN USA
[5] San Pietro Hosp, UPMC Hillman Canc Ctr, Radiat Oncol Unit, Rome, Italy
[6] IRCCS Neuromed, Pozzilli, IS, Italy
[7] Duke Univ, Dept Radiat Oncol, Durham, NC 27708 USA
[8] Duke Univ, Dept Neurosurg, Durham, NC 27708 USA