1. The RAND Corporation, Santa Monica, CA, USA
2. Nutrition and Physical Activity Program, Division of Chronic Disease and Injury Prevention, Los Angeles County Department of Public Health, Los Angeles, CA, USA
3. Kaiser Permanente Research and Evaluation, Pasadena, CA, USA
4. Department of Family Medicine, David Geffen School of Medicine at University of California, Los Angeles (UCLA), Los Angeles, CA, USA
5. Department of Epidemiology, UCLA Fielding School of Public Health, Los Angeles, CA, USA
6. Population Health Program, UCLA Clinical and Translational Science Institute, Los Angeles, CA, USA