1. Department of Biologic and Materials Sciences; University of Michigan School of Dentistry; Ann Arbor MI USA
2. Department of Periodontics and Oral Medicine; University of Michigan School of Dentistry; Ann Arbor MI USA
3. Department of Prosthodontics; Chonbuk National University School of Dentistry Research Institute of Clinical Medicine Chonbuk National University-Biomedical; Research Institute of Chonbuk National University Hospital Jeonju South Korea