1. Department of Pharmaceutical Sciences, University of the Sciences in Philadelphia, 600 South 43rd Street, Philadelphia, PA 19104, USA.
2. Pharmacokinetics, Pharmacodynamics, and Drug Metabolism (PPDM), Merck & Co., Inc. P.O. Box 4, 770 Sumneytown Pike, WP75A-203, West Point, PA 19486, USA.
3. Department of Mathematics, Physics, and Statistics, University of the Sciences in Philadelphia, 600 South 43rd Street, Philadelphia, PA 19104, USA.