Letter: Incidence of congenital limb-reduction deformities.
D004200:Diseases in Twins; D004480:Ectromelia / Q000453:epidemiology* / Q000235:genetics; D004739:England; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D012621:Seasons; D012744:Sex Ratio