[1] Univ Complutense Madrid, ETEP Etiol & Therapy Periodontal & Periimplant Di, Madrid, Spain
[2] Univ Gothenburg, Inst Odontol, Sahlgrenska Acad, Dept Periodontol, Gothenburg, Sweden
[3] Goethe Univ Frankfurt, Dept Oral Surg & Implantol, Frankfurt, Germany
[4] Univ Birmingham, Inst Clin Sci, Coll Med & Dent Sci, Periodontal Res Grp, Birmingham, W Midlands, England
[5] Birmingham Community Healthcare NHS Fdn Trust, Birmingham, England
[6] Univ Hosp Bonn, Dept Periodontol Operat & Prevent Dent, Bonn, Germany
[7] Univ Bern, Sch Dent Med, Dept Periodontol, Bern, Switzerland
[8] Columbia Univ, Coll Dent Med, Div Periodont, Sect Oral Diagnost & Rehabil Sci, New York, NY USA
[9] Shanghai Jiao Tong Univ, Shanghai People Hosp 9,Shanghai Key Lab Stomatol, Sch Med,Dept Oral & Maxillo Facial Implantol, Shanghai PerioImplant Innovat Ctr,Natl Clin Res C, Shanghai, Peoples R China