[1] Univ Oxford, Nuffield Dept Med, Oxford, England
[2] Natl Inst Dent & Craniofacial Res, Cell Biol Sect, Bethesda, MD USA
[3] Univ Alabama Birmingham, Sch Dent, Birmingham, AL USA
[4] Univ N Carolina, Oral & Maxillofacial Surg, Sch Med, Chapel Hill, NC USA
[5] Louisiana State Univ, Dept Prosthodont, Sch Dent, New Orleans, LA USA
[6] Harvard Sch Dent Med, Dept Restorat Dent & Biomat Sci, Boston, MA USA
[7] Harvard Sch Dent Med, Restorat Dent & Biomat Sci, Boston, MA USA
[8] Univ Alabama Birmingham, Sch Dent, Dept Clin & Community Sci Behav & Populat Sci Div, Birmingham, AL USA
[9] Univ Alabamaat Birmingham, Sch Dent, 1720 Univ Blvd, Birmingham, AL 35294 USA