1 Department of Anesthesiology and Pain Management, UT-Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, USA. gerald.matchett@utsouthwestern.edu.
2 Department of Anesthesiology and Pain Management, UT-Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX, USA.
3 Department of Anesthesiology, Parkland Health and Hospital System, Dallas, TX, USA.