1. Department of Endocrinology & Metabolism, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
2. Department of Biomedical Laboratory Science, College of Health Sciences, Cheongju University, Cheongju, Chungbuk, Republic of Korea
3. Department of Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
4. Department of Physiology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea