1. Department of Conservative Dentistry; School of Dentistry; Kyungpook National University; Daegu Korea
2. Area of Endodontics; Faculty of Dentistry; The University of Hong Kong; Hong Kong China
3. Department of Bioscience Research; College of Dentistry; University of Tennessee Health Science Center; Memphis TN USA
4. Dongnam Regional Division; Korea Institute of Industrial Technology; Jinju Korea
5. Department of Conservative Dentistry; School of Dentistry; Pusan National University; Dental Research Institute; Yangsan Korea