1. Department of Periodontology, Division of Oral Rehabilitation, Faculty of Dental Science; Kyushu University; Fukuoka Japan
2. Department of Endodontology; Kyushu University Hospital; Fukuoka Japan
3. Dental and Oral Medical Center; Kurume University School of Medicine; Kurume, Fukuoka Japan
4. Department of Clinical Chemistry and Laboratory Medicine, Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan