1. Department of Periodontology, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Korea.
2. Department of Periodontology, Seoul National University Dental Hospital, Seoul, Korea.
3. One-Stop Specialty Center, Seoul National University Dental Hospital, Seoul, Korea.
4. Medical & Bio Photonics Research Center, Korea Photonics Technology Institute (KOPTI), Gwangju, Korea.