1 Department of Anesthesiology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.
2 Department of Anesthesiology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA; Department of Surgery, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.
3 Department of Anesthesiology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA. Electronic address: kenichi-tanaka@ouhsc.edu.