1. Department of Radiation Oncology; Memorial Sloan Kettering Cancer Center; New York New York
2. Department of Radiation Oncology; Stanford University School of Medicine; Stanford California
3. Department of Epidemiology and Biostatistics; Memorial Sloan-Kettering Cancer Center; New York New York
4. Department of Medicine, Head and Neck Oncology Service; Memorial Sloan-Kettering Cancer Center; New York New York
5. Department of Surgery, Head and Neck Service; Memorial Sloan-Kettering Cancer Center; New York New York