1. Department of Endocrinology & Metabolism, College of MedicineKyung Hee University Seoul Republic of Korea
2. Department of Biomedical Laboratory Science, College of Health SciencesCheongju University Cheongju‐si Chungcheongbuk‐do Republic of Korea
3. Department of Medicine, Graduate SchoolKyung Hee University Seoule Republic of Korea
4. Department of Endocrinology & MetabolismKyung Hee University Hospital Seoul Republic of Korea