1. Department of Conservative Dentistry, College of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
2. The State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Sichuan 610042, China
3. Department of Restorative Dentistry, University of Otago, School of Dentistry, Dunedin 9016, New Zealand
4. Department of Oral Biological Sciences, University Lyon 1, Faculty of Odontology and Laboratory of Tissue Biology and Therapeutic Engineering, UMR5305 CNRS/University Lyon 1, 69372 Lyon, France
5. Department of General Dentistry, Tokushima University Hospital, Tokushima 770-8503, Japan