1. Department of Prosthodontics, Graduate School of Clinical Dentistry, Korea University, Seoul, Korea.
2. Department of Periodontology, Anam Hospital, Korea University, Seoul, Korea.
3. Medical College Department of Dentistry, Korea University, Seoul, Korea.
4. Institute of Human Genetics, College of Medicine, Korea University, Seoul, Korea.
5. Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea.
6. Department of Prosthodontics, Graduate School of Dentistry, Pusan National University, Yangsan, Korea.