1. Department of Radiation Oncology Vanderbilt University Medical Center Nashville Tennessee
2. Robert W. Franz Cancer Center Providence Portland Medical Center Portland Oregon
3. Section of Hematology/Oncology Department of Medicine and Comprehensive Cancer Center University of Chicago Medicine Chicago Illinois
4. Department of Medicine Henry Ford Hospital Detroit Michigan
5. Departments of Oncology and Otolaryngology, Sidney Kimmel Comprehensive Cancer Center Johns Hopkins University Baltimore Maryland