1 Department of Radiation Oncology, Head and Neck Oncology Program, Dana-Farber/Brigham & Women's Cancer Center, Harvard Medical School, Boston, Massachusetts. Electronic address: danielle_margalit@dfci.harvard.edu.
2 Department of Radiation Oncology, University of Colorado School of Medicine, Denver, Colorado.
3 Division of Radiation Oncology and Division of Medical Sciences, National Cancer Centre Singapore, Singapore.
4 Department of Radiation Oncology, University of Iowa Carver College of Medicine, Iowa City, Iowa.
5 Department of Human Oncology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.