1. Department of Physiology and Pharmacology, City University of New York Medical School, 138th Street and Convent Avenue, New York, NY 10031, U.S.A.
2. Division of Nutrition and Chronic Disease, Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808, U.S.A.
3. Department of Pharmacology, College of Medicine, University of Tennessee Health Science Center, 874 Union Avenue, Memphis, TN 38163, U.S.A.