1. Department of Anesthesiology, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania
2. Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania
3. Rowan University School of Osteopathic Medicine, Stratford, New Jersey
4. Department of Anesthesiology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania
5. Department of Surgery, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania
6. Department of Surgery, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania