aDepartment of Anesthesiology, Baylor College of Medicine, Houston, Texas

bDepartment of Anesthesiology, Mayo Clinic Arizona, Phoenix, Arizona

cDepartment of Anesthesiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA

Correspondence to Emily G. Teeter, MD, FASE, FASA, N2198 UNC Hospitals, CB #7010, Chapel Hill, NC 27599-7010, USA. Tel: +1 919 966 5136; e-mail: [email protected]