1. Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China,
2. Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
3. College and Hospital of Stomatology, Wuhan University, Wuhan, China
4. Department of Operative Dentistry and Endodontics, School of Dentistry, Iwate Medical University, 1-3-27 Chuoudouri, Morioka, Iwate 020-8505, Japan
5. Department of Pediatric Dentistry, Hokkaido University School of Dentistry, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan
6. Dental School, Adelaide University, South Australia 5005