1. Department of Oral Pathology, School of Dentistry, BK21, IHBR, Kyungpook National University, Daegu, Korea, Department of Oral Biochemistry, School of Dentistry, Kyungpook National University, Daegu, Korea, Department of Oral Anatomy and Neurobiology, School of Dentistry, Kyungpook National University Hospital, Daegu, Korea, and Department of Orthopaedic Surgery, Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, Daegu, Korea