1. Department of Medicine, University of Iowa, Iowa City, IA;
2. Department of Epidemiology, University of Iowa, Iowa City, IA;
3. Comprehensive Access & Delivery Research and Evaluation (CADRE) Center, Iowa City VA Hospital, Iowa City, IA;
4. Department of Emergency Medicine, University of Iowa, Iowa City, IA;
5. Department of Emergency Medicine, Iowa Methodist Medical Center, Des Moines, IA;
6. Department of Biostatistics, University of Iowa, Iowa City, IA;
7. Department of Radiology, University of Iowa, Iowa City, IA;
8. National Jewish Health, Denver, CO;
9. University of Michigan School of Nursing, Ann Arbor, MI
10. Department of Psychology, University of Iowa, Iowa City, IA;