1. Department of Anesthesiology, Walter Reed National Military Medical Center and Rotating Resident at Inova Fairfax Hospital, Bethesda, MD 20889, USA
2. Department of Anesthesiology, Walter Reed National Military Medical Center, Bethesda, MD 20889, USA
3. Department of Anesthesiology, Inova Fairfax Hospital, Falls Church, VA 22042, USA
4. National Capital Consortium Anesthesiology Residency Program, Uniformed Services University F. Edward Hebert School of Medicine, Walter Reed National Military Medical Center, Bethesda, MD 20889, USA