1. Department of Epidemiology University of Iowa College of Public Health Iowa City Iowa USA
2. Department of Emergency Medicine University of Iowa Carver College of Medicine Iowa City Iowa USA
3. Center for Comprehensive Access and Delivery Research and Evaluation Iowa City Veterans Affairs Health Care System Iowa City Iowa USA
4. Department of Biostatistics University of Iowa College of Public Health Iowa City Iowa USA
5. Department of Psychiatry University of Iowa Carver College of Medicine Iowa City Iowa USA
6. Department of Occupational and Environmental Health University of Iowa College of Public Health Iowa City Iowa USA
7. Department of Health Management and Policy University of Iowa College of Public Health Iowa City Iowa USA