1. US Centers for Disease Control and Prevention. 2013 Youth Risk Behavior Survey Data. Available at:www.cdc.gov/yrbs. Accessed July 7 2017.
2. US Centers for Disease Control and Prevention. National Center for Chronic Disease Prevention and Health Promotion Division of Nutrition Physical Activity and Obesity Data Trend and Maps. Available at:https://www.cdc.gov/nccdphp/dnpao/data‐trends‐maps/index/html. Accessed July 7 2017.