1. Department of Physiology and Pharmacology, College of Medicine, Chang Gung University, Tao-Yuan, Taiwan, Republic of China;
2. Program in Neuroscience, University of Maryland School of Medicine, Baltimore, Maryland;
3. Departments of Physiology and Psychiatry, University of Maryland School of Medicine, Baltimore, Maryland; and
4. Department of Pharmacology, University of Maryland School of Medicine, Baltimore, Maryland