1. Department of Emergency Medicine Columbia University Vagelos College of Physicians and Surgeons New York New York USA
2. Department of Emergency Medicine and Center for Bioethics and Medical Humanities Medical College of Wisconsin Milwaukee Wisconsin USA
3. Department of Emergency Medicine Wright State University Boonshoft School of Medicine Dayton Ohio USA
4. Billings Clinic Billings Montana USA
5. Riverwood Emergency Services Perrysburg Ohio USA