1. Division of Environmental Health Sciences, School of Public Health University of Minnesota Minneapolis Minnesota USA
2. Department of Emergency Medicine University of Iowa Carver College of Medicine Iowa City Iowa USA
3. The Center for Injury Research and Policy Abigail Wexner Research Institute at Nationwide Children's Hospital Columbus Ohio USA
4. Road Safety Institute University of Minnesota Minneapolis Minnesota USA
5. Department of Epidemiology, College of Public Health The University of Iowa Iowa City Iowa USA
6. Department of Occupational and Environmental Health The University of Iowa Iowa City Iowa USA