1. Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, Korea.
2. Department of Oral Surgery, School of Dentistry, Medical University of Vienna, Vienna, Austria.
3. Department of Periodontology, Faculty of Odontology, Malmö University, Malmö, Sweden.
4. Division of Regenerative Dental Medicine and Periodontology, University Clinics of Dental Medicine CUMD, University of Geneva, Geneva, Switzerland.