[1] Univ Gothenburg, Sahlgrenska Acad, Inst Odontol, Dept Periodontol, POB 450, S-40530 Gothenburg, Sweden
[2] Univ Calif San Francisco, San Francisco, CA 94143 USA
[3] Univ Estadual Maringa, Maringa, Parana, Brazil
[4] Univ Iowa, Iowa City, IA USA
[5] Univ Santiago de Compostela, Santiago, Spain
[6] Univ Calif Los Angeles, Los Angeles, CA USA
[7] Univ Melbourne, Melbourne, Vic, Australia
[8] Univ Texas Hlth Sci Ctr San Antonio, San Antonio, TX 78229 USA
[9] Univ Complutense, Madrid, Spain
[10] Univ Zurich, Clin Fixed & Removable Prosthodont & Dent Mat Sci, Zurich, Switzerland
[11] Univ Sydney, Sydney, NSW, Australia
[12] SUNY Stony Brook, Stony Brook, NY 11794 USA
[13] Seoul Natl Univ, Seoul, South Korea
[14] Univ Liege, Dept Periodontol & Oral Surg, Liege, Belgium
[15] Univ Michigan, Sch Dent, Ann Arbor, MI 48109 USA
[16] Leuven Univ, Flanders, Belgium
[17] Kristianstad Univ, Kristianstad, Sweden
[18] Univ Bern, Dept Periodontol, Bern, Switzerland
[19] Goethe Univ, Dept Oral Surg & Implantol, Carolinum, Frankfurt, Germany
[20] Columbia Univ, New York, NY USA
[21] Univ Basel, Dept Reconstruct Dent, Basel, Switzerland