1. Department of Dental Anesthesiology and Special Care Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
2. Department of Dental Anesthesiology, Okayama University Hospital, Okayama, Japan
3. Center for Promotion of Dental Education and International Collaboration, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan