1. Department of Endocrinology & Metabolism, School of Medicine; Kyung Hee University; Seoul 130-702 Republic of Korea
2. Department of Biomedical Laboratory Science, College of Health Sciences; Cheongju University; Cheongju Chungbuk 360-764 Republic of Korea
3. Department of Medicine, Graduate School; Kyung Hee University; Seoul 130-702 Republic of Korea
4. Department of Physiology; Kyung Hee University, College of Medicine; Seoul 130-701 Republic of Korea
5. Department of Biochemistry and Molecular Biology; Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, School of Medicine, Kyung Hee University; Seoul 130-701 Republic of Korea