1. Department of Emergency Medicine, University of Iowa Carver College of Medicine, Iowa City, IA, USA
2. Department of Epidemiology, University of Iowa College of Public Health, Iowa City, IA, USA
3. Department of Health Management and Policy, University of Iowa College of Public Health, Iowa City, IA, USA
4. Hardin Library for the Health Sciences, University of Iowa, Iowa City, IA, USA
5. Department of Anesthesia Critical Care, University of Iowa Carver College of Medicine, Iowa City, IA, USA