1. Department of Applied Health Science, Indiana University School of Public Health-Bloomington , 1025 E. 7th Street, Suite 116, Bloomington, IN 47405, USA
2. School of Social Work, University of Montana , 32 Campus Drive, Missoula, MT 59812, USA
3. Department of Sociology, Tulane University , 220E Newcomb Hall, New Orleans, LA 70118, USA
4. School of Medicine, Duke University , 40 Duke Medicine Circle, 124 Davison Building, Durham, NC 27710, USA