[1] Clinic of Cranio-Maxillofacial and Oral Surgery,
[2] Centre for Dental Medicine,undefined
[3] University of Zurich,undefined
[4] Plattenstrasse 11,undefined
[5] Department of Periodontology,undefined
[6] Operative and Preventive Dentistry,undefined
[7] University of Bonn,undefined
[8] Welschnonnenstraße 17,undefined
[9] School of Dentistry,undefined
[10] Periodontal Research Group,undefined
[11] University of Birmingham,undefined
[12] Birmingham,undefined
[13] Facultad de Odontología,undefined
[14] Universidad Compludense,undefined
[15] Plaza Ramón y Cajal s/n (Ciudad Universitaria),undefined
[16] Department of Oral & Maxillofacial Surgery,undefined
[17] Red Cross Hospital,undefined
[18] Hansteinstraße 29,undefined
[19] D-34121 Kassel,undefined
[20] Germany; Department of Oral & Maxillofacial Surgery,undefined
[21] Lecturer,undefined
[22] University Hospital Schleswig-Holstein,undefined
[23] Arnold-Heller-Straße 3,undefined