1. Department of Pharmacology, School of Medicine, Kyungpook National University, Daegu 700-422, Korea.
2. Department of Neurology, School of Medicine, Kyungpook National University, Daegu 700-422, Korea.
3. Brain Science and Engineering Institute, Kyungpook National University, Daegu 700-422, Korea.
4. Department of Pharmacology, School of Medicine, Keimyung University, Daegu 700-712, Korea.
5. Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 700-412, Korea.