1. Department of Odontology; Fukuoka Dental College; 2-15-1 Tamura, Sawara-ku Fukuoka 814-0193 Japan
2. Department of Morphological Biology; Fukuoka Dental College; Fukuoka Japan
3. Department of Pathology and Microbiology; Faculty of Medicine; Saga University; Saga Japan
4. Department of Physiological Science & Molecular Biology; Fukuoka Dental College; Fukuoka Japan