1. Division of Dental Anesthesiology, Department of Oral Health and Clinical Science, Tokyo Dental College, (Suidoubashi Hospital, Dental Anesthesia/Orofacial Pain Center), 2-9-18, Misaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan
2. Department of Dental Anesthesiology, Tokyo Dental College, 2-9-18, Misaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan