1 Surgical Intensive Care Unit, Critical Care Medicine, Department of Anesthesiology, Washington University School of Medicine, 660 S. Euclid Ave., Campus Box 8054, St. Louis, MO, 63110, USA.
2 Anesthesiology, Medicine, Surgery, and Developmental Biology, Washington University School of Medicine, 660 S. Euclid Ave., Campus, Box 8054, St. Louis, MO, 63110, USA.
3 Department of Emergency Medicine, UT Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX, 75390, USA. erik.kulstad@utsouthwestern.edu.