1. Department of Oral and Maxillofacial Surgery, School of Medicine, Dong-A University, Busan, Korea.
2. Department of Nursing, School of Natural Sciences, Pukyong National University, Busan, Korea.
3. Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Yangsan, Korea.
4. Department of Oro-facial Pain and Oral Medicine, School of Dentistry, Pusan National University, Yangsan, Korea.