[1] Med Univ South Carolina, Dept Anesthesiol & Perioperat Med, 25 Courtenay Dr,Suite 4200,MSC 240, Charleston, SC 29425 USA
[2] Penn State Milton S Hershey Med Ctr D, Dept Anesthesiol & Perioperat Med, Hershey, PA USA
[3] Wake Forest Univ, Dept Anesthesiol & Perioperat Med, Winston Salem, NC 27101 USA
[4] Penn State Coll Med & Engn, Dept Radiol & Engn Design, Hershey, PA USA
[5] Penn State Milton S Hershey Med Ctr, Dept Surg, Div Cardiac Surg, Hershey, PA USA