1. Department of Statistics, University of Washington, Seattle, WA 98195-4322
2. Department of Sociology, University of Washington, Seattle, WA 98195-3340
3. Department of Statistics, Iowa State University, Ames, IA 50011-1210
4. Department of Statistics, University of Florida, Gainesville, FL 32611
5. Department of Biostatistics, Brown University, Providence, RI 02912
6. Department of Epidemiology and Population Health, Stanford University, Stanford, CA 94305
7. Department of Statistical Science, Duke Global Health Institute, Duke University, Durham, NC 27710
8. Department of Statistical Sciences, University of Toronto, Toronto M5S 1X6, Canada