1. Unit of Periodontology UCL Eastman Dental Institute London UK
2. University Complutense of Madrid ETEP Research Group Madrid Spain
3. Department of Restorative Dentistry Universiti Malaya Kuala Lumpur Malaysia
4. Shanghai Perio Implant Innovation Center, Department of Oral and Maxillofacial Implantology, National Clinical Research Center of Stomatology, Shanghai Ninth People's Hospital, School of Medicine Shanghai Jiao Tong University Shanghai China
5. European Research Group on Periodontology Genoa Italy