1. Department of Removable Prosthodontics, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
2. Department of Internal Medicine, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
3. Department of Cardiovascular Physiology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science, Okayama, Japan.
4. Department of Periodontology, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.