[1] Univ Michigan, Sch Dent, Curriculum & Program Evaluat, Ann Arbor, MI 48109 USA
[2] Tufts Univ, Sch Dent Med, One Kneeland St, Medford, MA 02111 USA
[3] Tufts Univ, Sch Dent Med, Publ Hlth & Community Serv, Medford, MA 02155 USA
[4] Univ Michigan, Sch Dent, Ann Arbor, MI 48109 USA