1. Department of Medical Oncology, University of Colorado Anschutz School of Medicine, Aurora, Colorado, USA
2. Department of Health Systems, Management and Policy, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
3. Department of Radiation Oncology, University of Colorado Anschutz School of Medicine, Aurora, Colorado, USA
4. Department of Radiation Oncology, City of Hope, Duarte, California, USA
5. Department of Otolaryngology, University of Colorado Anschutz School of Medicine, Aurora, Colorado, USA
6. University of Colorado Anschutz School of Medicine, Aurora, Colorado, USA