1 Department of Respiratory Care, University of Texas Medical Branch, Galveston, Texas. mnkhan@utmb.edu.
2 Department of Respiratory Care, University of Texas Medical Branch, Galveston, Texas.
3 Department of Surgery, Division of Trauma, Critical Care and Acute Care Surgery, University of Cincinnati, Cincinnati, Ohio.
4 Department of Anesthesiology, University of Texas Medical Branch, Galveston, Texas.
5 Department of Surgery, Division of Trauma, Critical Care and Acute Care Surgery, University of Cincinnati; and Airman Biosciences Division, Airman Systems Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, Ohio.