1. Department of Prosthodontics, Institute of Oral Bioscience, School of DentistryJeonbuk National University and Research Institute of Clinical Medicine of Jeonbuk National University‐Biomedical Research Institute of Jeonbuk National University Hospital Jeonju Republic of Korea
2. Department of Biologic and Materials Sciences & ProsthodonticsUniversity of Michigan School of Dentistry Ann Arbor MI