1. Institute of Chinese Pharmaceutical Sciences, China Medical College, 91, Hsueh-Shih Road, Taichung 404, Taiwan, Republic of China, School of Pharmacy, China Medical College, 91, Hsueh-Shih Road, Taichung 404, Taiwan, Republic of China, and Department of Education and Research, Taichung Veterans General Hospital, Taichung 407, Taiwan, Republic of China