*Anesthesiology and Perioperative Medicine, University of Louisville, Louisville
†Pain Management Center of Paducah, Paducah
§UK HealthCare Pain Services
∥Department of Anesthesiology, University of Kentucky, Lexington, KY
‡Tri-State Spine Care Institute Cincinnati, OH
¶Department of Anesthesiology Pain Services
#Department of Pharmacology, LSU School of Medicine, New Orleans, LA
The authors declare no conflict of interest.