1. Department of Dental Anesthesiology and Pain Management, Tohoku University Hospital, Sendai, Japan
2. Department of Oral Medicine and Surgery, Division of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Tohoku University, Sendai, Japan
3. Department of Oral and Maxillofacial Surgery, International University of Health and Welfare Hospital, Tochigi, Japan
4. Department of Anesthesiology and Perioperative Medicine, Tohoku University Hospital, Sendai, Japan.