1. Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
2. Department of Life Science, Ewha Woman's University, Seoul 120-750, Republic of Korea
3. Department of Biochemistry, School of Life Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea
4. Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu 700-721, Republic of Korea