1. *Associate Professor, Department of Dental Anesthesiology, Tokyo Dental College, Tokyo, Japan
2. †Postgraduate Student, Department of Dental Anesthesiology, Tokyo Dental College, Tokyo, Japan
3. ‡Senior Assistant Professor, Department of Dental Anesthesiology, Tokyo Dental College, Tokyo, Japan
4. §Professor and Chairman, Department of Dental Anesthesiology, Tokyo Dental College, Tokyo, Japan