1. Department of Psychiatry, Gangnam Severance Hospital, College of Medicine, Yonsei University, Seoul, Korea.
2. Department of Dentistry, Yongin Severance Hospital, Yonsei University, Yongin, Korea.
3. Department of Oral and Maxillofacial Surgery, Gangnam Severance Hospital, College of Dentistry, Yonsei University, Seoul, Korea.