1. Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
2. Department of Oral Health and Clinical Science, Tokyo Dental College, Tokyo 101-0061, Japan
3. Department of Anesthesiology & Pain Medicine, Juntendo University School of Medicine, Tokyo 113-8431, Japan
4. Department of Anesthesiology, Pain Relief Center, JR Tokyo General Hospital, Tokyo 151-8528, Japan
5. Department of Anesthesiology, Nihon University School of Medicine, Tokyo 173-8610, Japan
6. University Research Center, Nihon University, Tokyo 173-8610, Japan
7. Department of Surgery, Toho University Sakura Medical Center, Chiba 285-8741, Japan
8. Department of Anesthesiology, Saitama Medical University International Medical Center, Saitama 350-1298, Japan
9. Department of Dental Anesthesiology, Tokyo Dental College, Tokyo 101-0061, Japan