1. Department of Oral Biology, Binzhou Medical University, Yantai, Shandong, China
2. Department of Dentistry, Presbyterian Medical Center, Jeonju, Republic of Korea
3. Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Republic of Korea
4. Department of Prosthodontics, School of Dentistry, Jeonbuk National University, Jeonju, Republic of Korea
5. Department of Preventive Dentistry, School of Dentistry, BK21 Plus Program, Jeonbuk National University, Jeonju, Republic of Korea