1. Department of Emergency Medicine, University of California Irvine Medical Center, Orange, California, USA.
2. Department of Emergency Medicine, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA.
3. Albany Medical College, Albany, New York, USA.
4. Western University of Health Sciences College of Osteopathic Medicine of the Pacific-Northwest, Lebanon, Oregon, USA.
5. Department of Emergency Medicine, Hennepin County Medical Center, Minneapolis, Minnesota, USA.
6. Department of Internal Medicine, Maine Medical Center, Portland, Maine, USA.
7. Division of Wilderness Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA.