[1] Univ Helsinki, Dept Oral & Maxillofacial Dis, Helsinki, Finland
[2] Helsinki Univ Hosp, Helsinki, Finland
[3] Karolinska Inst, Dept Dent Med, Huddinge, Sweden
[4] Inst Mol Dent, Solingen, Germany
[5] Philipps Univ Marburg, Dept Periodontol, Marburg, Germany
[6] Univ Chile, Fac Dent, Lab Periodontal Biol, Av Sergio Livingstone Polhammer 943, Santiago 8380492, Chile
[7] Univ Chile, Fac Dent, Dept Oral Pathol & Med, Av Sergio Livingstone Polhammer 943, Santiago 8380492, Chile
[8] Univ Autonoma Chile, Fac Hlth Sci, Dent Unit, El Llano Subercaseaux 2801, San Miguel Santiago 8910060, Chile