Ann A Lazar1, Tania L Ceron Lizarraga2, Mack Roach2. 1. Department of Radiation Oncology, Divisions of Oral Epidemiology & Dental Public Health and Biostatistics, University of California San Francisco, San Francisco, CA, USA. Electronic address: ann.lazar@ucsf.edu. 2. Department of Radiation Oncology, University of California San Francisco, Helen Diller Family Comprehensive Cancer Center, San Francisco, CA, USA.