abstracts bibliography care casestudies childhealthservices clinicalinfantdevelopmentprogram(princegeorge'scounty clinicalinfantdevelopmentprogram(princegeorgescounty control developmentaldisabilities diseases europe ff1821 healthandhygiene healthpolicy infantmortality infants latinamerica maryland maternalhealthservices mortality prevention wa310i43 wa310m647m1987