1. Department of Neuroscience and Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
2. Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Japan
3. Department of Special Care Dentistry, Osaka Dental University Hospital, Osaka, Japan
4. Department of Oral Physiology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
5. Division of Behavioral Physiology, Department of Behavioral Sciences, Osaka University Graduate School of Human Sciences, Suita, Japan