title: Mental retardation and multiple congenital anomalies of unknown etiology: frequency of occurrence in similarly affected sibs of the proband.
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D002877:Chromosomes, Human; D005260:Female; D005787:Gene Frequency; D005817:Genetic Counseling; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D012189:Retrospective Studies; D012306:Risk