1. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
2. Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
3. Department of Education, University of Erlangen-Nuremberg, Nürnberg, Germany
4. Monitoring & Evaluation, MENTOR, Boston, USA
5. Data Soapbox, Cary, North Carolin, USA