title: Challenges and changes.
authors.affiliation: Dean Emeritus, College of Dental Medicine, Columbia University, New York, NY.
authors.forename: Allan J
authors.initials: AJ
authors.lastname: Formicola
authors.affiliation: Professor Emeritus, University of Connecticut, Health Science Center, Storrs, CT.
authors.forename: Howard
authors.initials: H
authors.lastname: Bailit