1. Division of Periodontology and Implant Dentistry Faculty of Dentistry The University of Hong Kong Hong Kong SAR China
2. Department of Oral Implantology Shanghai Ninth People HospitalShanghai Jiao Tong University School of MedicineCollege of Stomatology; National Center of Stomatology; National Clinical Research Center of Oral Diseases; Shanghai key Laboratory of Stomatology Shanghai China
3. European Research Group on Periodontology Genova Italy