[1] Massachusetts Gen Hosp, Gen Practice Residency, Boston, MA 02114 USA
[2] Harvard Sch Dent Med, Dept Oral Hlth Policy & Epidemiol, Adv Grad Educ Program Dent Publ Hlth, Boston, MA 02115 USA
[3] Univ Penn, Sch Dent Med, Adv Grad Program Endodont, Philadelphia, PA 19104 USA
[4] Boston Univ, Henry M Goldman Sch Dent Med, Dept Gen Dent, Sect Predoctoral Periodontol, Boston, MA 02118 USA
[5] Harvard Sch Dent Med, Dept Restorat Dent & Biomat Sci, Adv Grad Program Endodont, Boston, MA 02115 USA
[6] Harvard Sch Dent Med, Dept Restorat Dent & Biomat Sci, Boston, MA 02115 USA