1. Research Center for Endocrine and Metabolic Diseases, Department of Medical Science, Chungnam National University College of Medicine, Daejeon, Korea
2. Department of Pathology, Chungnam National University College of Medicine, Daejeon, Korea
3. Department of Otolaryngology-Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, Korea
4. Department of Internal Medicine, Chungnam National University College of Medicine, Daejeon, Korea