1. Department of Periodontology National Health Insurance Service Ilsan Hospital Goyang‐si Gyeonggi‐do South Korea
2. Department of Research and Analysis, Research Institute National Health Insurance Service Ilsan Hospital Goyang‐si Gyeonggi‐do South Korea
3. Department of Oral and Maxillofacial Surgery National Health Insurance Service Ilsan Hospital Goyang‐si Gyeonggi‐do South Korea
4. The Shapiro Family Laboratory of Viral Oncology and Aging Research School of Dentistry, University of California Los Angeles Los Angeles California USA