1. School of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan 807, Republic of China, Ta-Jen Institute of Technology, Ping Tung Hsieng, Taiwan 907, Republic of China, Institute of Chinese Pharmaceutical Science, China Medical College, Taichung, Taiwan 404, Republic of China, and Department of Education and Research, Taichung Veterans General Hospital, Taichung, Taiwan 407, Republic of China