1. a U.S. Health, Public Health & Epidemiology , Abt Associates, Inc. , Bethesda , Maryland
2. b Center for the Integration of Research & Practice (CIRP) , National Development & Research Institutes, Inc. (NDRI) , New York , New York
3. c University of Manitoba , Winnipeg , MB , Canada
4. d Johns Hopkins University Bloomberg School of Public Health , Baltimore , Maryland