[1] Southern Illinois Univ, Sch Dent Med, Appl Dent Med, 2800 Coll Ave,285 Bldg, Alton, IL 62002 USA
[2] Natl Inst Dent & Craniofacial Res, Off Sci Policy & Anal, NIH, Bethesda, MD USA
[3] Amer Dent Educ Assoc, Off Policy Res & Divers, Washington, DC USA