1. Departments of Discovery Chemistry, Merck & Co., Inc., 770 Sumneytown Pike, PO Box 4, West Point, Pennsylvania 19486, USA
2. Translational Imaging, Merck & Co., Inc., 770 Sumneytown Pike, PO Box 4, West Point, Pennsylvania 19486, USA
3. Pharmacology, Merck & Co., Inc., 770 Sumneytown Pike, PO Box 4, West Point, Pennsylvania 19486, USA
4. Neuroscience Biology Discovery, Merck & Co., Inc., 770 Sumneytown Pike, PO Box 4, West Point, Pennsylvania 19486, USA