1. Division of Endocrinology and Metabolism, Department of Internal Medicine, Korea University College of Medicine, Korea University Anam Hospital, Seoul, Republic of Korea.
2. Department of Otolaryngology, Korea University College of Medicine, Korea University AnSan Hospital, AnSan, Republic of Korea.
3. Division of Endocrinology and Metabolism, Department of Internal Medicine, Korea University College of Medicine, Korea University AnSan Hospital, AnSan, Republic of Korea.