[1] Univ Iowa, Coll Dent, Dept Prevent & Community Dent, 801 Newton Rd, Iowa City, IA 52242 USA
[2] Univ Alabama Birmingham, Sch Dent, Dept Pediat Dent, Birmingham, AL 35294 USA
[3] Univ Iowa, Coll Publ Hlth, Dept Epidemiol, Iowa City, IA USA
[4] Univ Iowa, Dept Biostat, Coll Publ Hlth, Iowa City, IA USA
[5] Univ Iowa, Coll Dent, Dept Operat Dent, Iowa City, IA 52242 USA
[6] Univ Iowa, Iowa City, IA USA
[7] Univ Alabama Birmingham, Birmingham, AL USA