1. Department of Periodontology, Research Institute for Periodontal Regeneration Yonsei University College of Dentistry Seoul South Korea
2. Clinic of Reconstructive Dentistry, Center of Dental Medicine University of Zurich Zurich Switzerland
3. Faculty of Dentistry Universidad Finis Terrae Santiago Chile
4. Department of Neurosciences, Dentistry Section University of Padova Padova Italy