[1
]
Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center,
Houston, Texas. Electronic address: sjfrank@mdanderson.org.
[2
]
Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center,
Houston, Texas.
[3
]
Department of Radiation Physics, The University of Texas MD Anderson Cancer Center,
Houston, Texas.
[4
]
Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center,
Houston, Texas.
[5
]
Department of Head and Neck Medical Oncology, The University of Texas MD Anderson
Cancer Center, Houston, Texas.
[6
]
Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston,
Texas.