This study was supported by U.S. Public Health Service Grant DE 02702 from the National Institute of Dental Research, National Institutes of Health, Bethesda, Maryland.
Supported by USPHS research grant HD-154 from the National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA.
Aided in part by a Grant (NB-00965), National Institute of Neurological Diseases and Blindness, and (DE-01715), National Institute of Dental Research, National Institutes of Health.