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Recruiting control subjects who are representative of the population from which the cases are drawn is a challenge in case-control studies

Many birth defects surveillance programs ascertain cases of birth defects diagnosed beyond 1 year of age.

Association of pre-pregnancy weight, birth defects

Congenital anomalies--why bother?

After randomized, controlled trials established that consumption of folic acid before pregnancy and during the early weeks of gestation reduces the risk...

This paper discusses changes in diagnostic criteria, decreasing age at diagnosis, improved case ascertainment, diagnostic substitution, and social influences.

Physical and mental health in mothers of children with Down syndrome.

To investigate perinatal risk factors for childhood Type 1 diabetes in Western Australia, using a complete population-based cohort.

Information on presence and age at onset of seizures, perinatal and developmental history, and genetic status was abstracted on 275 cases in the Australian...

To examine the prevalence, cumulative incidence, and survival in an Australian cohort with Rett syndrome (RTT).