1. Department of Emergency Medicine University of Nebraska Medical Center Omaha NebraskaUSA
2. Department of Emergency Medicine State University of New York at Buffalo Buffalo New YorkUSA
3. University of Iowa Iowa City IowaUSA
4. Department of Emergency Medicine Mayo Clinic College of Medicine and Science Rochester MinnesotaUSA
5. Department of Internal Medicine Division of Immunology University of Iowa Hospitals and Clinics Iowa City IowaUSA
6. Department of Emergency Medicine University of Iowa Hospitals and Clinics Iowa City IowaUSA