1 Department of Anesthesiology, University of Arkansas for Medical Sciences, UAMS Medical Center, 4301 West Markham St, Little Rock, AR 72205. Electronic address: skent@uams.edu.
2 Department of Anesthesiology, University of Arkansas for Medical Sciences, UAMS Medical Center, 4301 West Markham St, Little Rock, AR 72205. Electronic address: grmehaffey@uams.edu.