1. Department of Endodontology and Operative Dentistry; Faculty of Dental Science; Kyushu University; Fukuoka Japan
2. Division of Endodontology; Kyushu University Hospital; Kyushu University; Fukuoka Japan
3. Division of General Dentistry; Kyushu University Hospital; Kyushu University; Fukuoka Japan
4. Faculty of Dental Science; OBT Research Center; Kyushu University; Fukuoka Japan