[Frequency and trends of congenital defects in Spain: usefulness and significance of different frequencies].
Martínez-Frías
M L
ML
Estudio Colaborativo Español de Malformaciones Congénitas (ECEMC), Facultad de Medicina, Universidad Complutense de Madrid. luisama@eucmos,sim.ucm.es
Bermejo
E
E
D000013:Congenital Abnormalities / Q000453:epidemiology*; D006801:Humans; D007231:Infant, Newborn; D015995:Prevalence; D013030:Spain / Q000453:epidemiology; D013997:Time Factors