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Pratt and Simões are with the National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA. Brownson and Parra are with the Prevention Research Center in St. Louis, George Warren Brown School of Social Work, Washington University in St. Louis. Brownson is also with the Dept of Surgery and Alvin J. Siteman Cancer Center, Washington University School of Medicine, Washington University in St. Louis. Ramos is with the Dept of Preventive Medicine, Universidade Federal de São Paulo, São Paulo, Brazil. Malta is with the Division of Situation Analysis and Prevention of Non-transmissible Diseases, Brazil Ministry of Health, Brasilia, Brazil. Hallal is with the Post-graduate Program in Epidemiology, Federal University of Pelotas, Brazil. Reis is with the Pontifícia Universidade Católica do Paraná, Brazil, and the Universidade Federal do Paraná, Brazil.