1. Division of Epidemiology Herbert Wertheim School of Public Health, University of California San Diego La Jolla CA USA
2. Division of Public Health Sciences Fred Hutchinson Cancer Center Seattle WA USA
3. Center for Children’s Healthy Lifestyles and Nutrition, Children’s Mercy Kansas City Kansas City MO USA
4. Department of Epidemiology and Environmental Health, School of Public Health and Health Professions University at Buffalo – SUNY Buffalo NY USA