1. Instructor in Anesthesiology.
2. Clinical Fellow in Cardiothoracic Anesthesiology.
3. Assistant Professor of Mathematics and Biostatistics, Department of Mathematics, Washington University, St. Louis, Missouri. ** Participants of the B-Unaware Study Group are listed in the appendix.
4. Research Assistant.
5. Resident.
6. Associate Professor of Anesthesiology and Surgery, Division Chief, Cardiothoracic Anesthesiology and Cardiothoracic Intensive Care, Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri.