1. Department of Biostatistics and Bioinformatics Duke University School of Medicine Durham North Carolina
2. Department of Methodology and Statistics Utrecht University Utrecht The Netherlands
3. Clinical Epidemiology Program Ottawa Hospital Research Institute Ottawa Ontario Canada
4. School of Epidemiology and Public Health University of Ottawa Ottawa Ontario Canada
5. Department of Biostatistics Yale School of Public Health New Haven Connecticut
6. Center for Methods in Implementation and Prevention Science Yale University New Haven Connecticut