1. KU Leuven BIOMAT, Department of Oral Health Sciences, Biomedical Sciences Group, KU Leuven (University of Leuven), Leuven, Belgium
2. Division of General Dentistry, Department of Clinical Oral Health Science, Tokyo Dental College, Tokyo, Japan
3. Section of Operative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, KU Leuven (University of Leuven), Leuven, Belgium
4. Department of Conservative Dentistry, Periodontology and Preventive Dentistry, Hannover Medical School, Hannover, Germany
5. Department of Dentistry, Toranomon Hospital, Tokyo, Japan