1. Department of Oral and Maxillofacial Surgery; College of Dentistry; Yonsei University; Seoul Korea
2. Department of Periodontology; Research Institute for Periodontal Regeneration; College of Dentistry; Yonsei University; Seoul Korea
3. Unit of Periodontology; Department of Clinical Research; UCL Eastman Dental Institute; London UK
4. Department of Ophthalmology; Yonsei University College of Medicine; Seoul Korea