1. Department of Oral and Maxillofacial Radiology and Wonkwang Dental Research Institute, College of Dentistry, Wonkwang University, Iksan, Korea.
2. Department of Internal Medicine, School of Medicine, Wonkwang University, Iksan, Korea.
3. Department of Oral and Maxillofacial Surgery, College of Dentistry, Wonkwang University, Iksan, Korea.