1 Department of Anesthesiology, Shock Trauma and Anesthesiology Research Center, University of Maryland School of Medicine, Baltimore, MD, 21201, USA. tkristian@som.umaryland.edu.
2 Veterans Affairs Maryland Health Center System, 10 North Greene Street, Baltimore, MD, 21201, USA. tkristian@som.umaryland.edu.
3 Department of Anesthesiology, Shock Trauma and Anesthesiology Research Center, University of Maryland School of Medicine, Baltimore, MD, 21201, USA. bhu@som.umaryland.edu.
4 Veterans Affairs Maryland Health Center System, 10 North Greene Street, Baltimore, MD, 21201, USA. bhu@som.umaryland.edu.