1. Assistant Professor of Anesthesia, Cardiovascular Anesthesia Research Laboratory, Department of Anesthesia, College of Medicine, University of Iowa, Iowa City, Iowa.
2. Resident in Anesthesia, Cardiovascular Anesthesia Research Laboratory, Department of Anesthesia, College of Medicine, University of Iowa, Iowa City, Iowa.
3. Visiting Research Fellow, Department of Anesthesia, Catholic University Medical College, Seoul, Korea.
4. Research Assistant, Cardiovascular Anesthesia Research Laboratory, Department of Anesthesia, College of Medicine, University of Iowa, Iowa City, Iowa.