1. Division of Orthodontics; College of Dentistry; University of Kentucky; Lexington KY USA
2. Center for Oral Health Research; College of Dentistry; University of Kentucky; Lexington KY USA
3. Department of Statistics; University of Kentucky; Lexington KY USA
4. School of Dental Medicine; University of Puerto Rico; San Juan PR USA
5. Caribbean Primate Research Center; Sabana Seca PR USA