1. Associate Professor and Chairman, Department of Pharmacology and Toxicology, School of Pharmacy, University of Maryland, Baltimore, Maryland 21201
2. Research Associate, Department of Anesthesiology, School of Medicine, University of Maryland
3. Associate Professor of Anesthesiology, School of Medicine, University of Maryland. Present address: Department of Anesthesiology, Case Western Reserve University, School of Medicine, Cleveland, Ohio 44106