1. Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota, USA.
2. Fenway Institute, Fenway Health, Boston, Massachusetts, USA.
3. Department of Social and Behavioral Sciences, College of Public Health, Temple University, Philadelphia, Pennsylvania, USA.
4. Department of Urology, University of Minnesota, Minneapolis, Minnesota, USA.
5. Department of Medicine, University of Minnesota Medical School, Minneapolis, Minnesota, USA.
6. School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA.