1. Division of Infectious Diseases, Duke University, Durham North Carolina, NC, United States of America
2. Center for
Social and Behavioral Research, University of Northern Iowa, Cedar Falls, Iowa, IA, United States of America
3. Department of Population Health Sciences, Duke University, Durham, North Carolina, NC, United States of America
4. Duke Initiative on Survey Methodology, Duke University, Durham, North Carolina, NC, United States of America
5. Department of Emergency Medicine, West Virginia University Health Sciences Center, Morgantown, West Virginia,
WV, United States of America