[1] Privatklin Schloss Schellenstein, Schellenstein 1, D-59939 Olsberg, Germany
[2] Univ Munster, Dept Oral & Maxillofacial Surg, Munster, Germany
[3] Fachzahnarzt Zentrum Weser, Hameln, Germany
[4] Private Dent Clin Schloss Schellenstein, Dept Periodontol, Olsberg, Germany
[5] Univ Klinikum Dusseldorf, Dept Oral Surg, Dusseldorf, Germany
[6] Goethe Univ Frankfurt, Carolinum, Dept Oral Surg & Implantol, Frankfurt, Germany
[7] Seoul Natl Univ, Sch Dent, Dent Res Inst, Dept Periodontol, Seoul, South Korea
[8] Univ Bern, Sch Dent Med, Dept Periodontol, Bern, Switzerland
[9] SUNY Stony Brook, Sch Dent Med, Dept Periodontol, Stony Brook, NY 11794 USA