1,813
Participants
Start Date
December 21, 2004
Study Completion Date
June 29, 2012
National Institutes of Health Clinical Center, 9000 Rockville Pike, Bethesda
Associacao dos Gemeos do Norte de Minas Gerais, Minas Gerais
Universidad Peruana Cayetano Heredia, Lima
National Institute of Dental and Craniofacial Research (NIDCR)
NIH