1. Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL 32610
2. Department of Pharmacology and Therapeutics, LSUHSC-S, Shreveport, LA 71130
3. Department of Neuroscience, University of Florida, Gainesville, FL 32610, and Veterans Administration Medical Center, Gainesville, FL 32610
4. Department of Pharmaceutics, University of Florida, Gainesville, FL 32610
5. Department of Pharmacodynamics, University of Florida, Gainesville, FL 32610