1. Department of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of Dentistry, Suita, Japan
2. Department of Medical Statistics, Osaka Metropolitan University Graduate School of Medicine and Faculty of Medicine, Osaka, Japan
3. Department of Restorative Dentistry, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan
4. KU Leuven (University of Leuven), Department of Oral Health Sciences, BIOMAT & UZ Leuven (University Hospitals Leuven), Leuven, Belgium