1. Division of Epidemiology and Community Health, School of Public Health, Minnesota Population Center, University of Minnesota, Minneapolis, MN, USA
2. Minnesota Population Center, University of Minnesota, Minneapolis, MN, USA
3. Departments of Forestry and Public Health, Michigan State University, East Lansing, MI, USA
4. Institute for Child, Youth and Family Policy, Heller School for Social Policy and Management, Brandeis University, Waltham, MA, USA