1. Department of Operative Dentistry and Periodontology, University Hospital Freiburg, School of Dentistry, Freiburg, Germany
2. Department of Prosthodontics, University Hospital Freiburg, School of Dentistry, Freiburg, Germany
3. Department of Hematology and Oncology, Core Facility, Albert Ludwigs University, Freiburg, Germany
4. Center for Medical Biometry and Medical Informatics, Institute for Medical Biometry and Statistics, Medical Center, University of Freiburg, Freiburg, Germany
5. Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, South Korea