[1] Univ Freiburg, Med Ctr, Fac Med, Dept Operat Dent & Periodontol,Div Cariol, Freiburg, Germany
[2] Univ Texas Hlth Sci Ctr San Antonio, Dept Comprehens Dent, San Antonio, TX 78229 USA
[3] Kings Coll London, Guys Hosp London, Dept Prosthodont, Dent Inst, London, England
[4] Univ Sao Paulo, Bauru Sch Dent, Dept Biol Sci, Bauru, SP, Brazil
[5] Univ Bern, Sch Dent Med, Dept Restorat Prevent & Pediat Dent, Bern, Switzerland
[6] Dent Clin Justus Liebig Univ Giessen, Dept Conservat & Prevent Dent, Giessen, Germany
[7] Indiana Univ, Sch Dent, Dept Cariol Operat Dent & Dent Publ Hlth, Oral Hlth Res Inst, Indianapolis, IN USA
[8] Radboud Univ Nijmegen, Dept Dent, Med Ctr, Nijmegen, Netherlands
[9] Kings Coll London, Guys Dent Hosp, Fac Dent Oral & Craniofacial Sci, Ctr Oral Clin & Translat Sci, London, England
[10] Univ Pittsburgh, Sch Dent Med, Dept Oral Biol, Pittsburgh, PA USA
[11] Univ Bristol, Clin Trials Unit, Dent Sch & Hosp, Bristol, Avon, England
[12] Univ Med Ctr Gottingen, Dept Prevent Dent Periodontol & Cariol, Gottingen, Germany
[13] Univ Oslo, Fac Dent, Inst Clin Dent, Dept Cariol & Gerodontol, Oslo, Norway