1 Department of Anesthesiology and Orthopaedics and Rehabilitation, University of Florida College of Medicine, PO Box 100254, Gainesville, FL 32610-0254, USA. Electronic address: tvasilopoulos@anest.ufl.edu.
2 Department of Anesthesiology, University of Florida College of Medicine, PO Box 100254, Gainesville, FL 32610-0254, USA. Electronic address: bfahy@anest.ufl.edu.