title: Deaths in the first 20 years and problems of the sex ratio at birth.
authors: Research Unit, Royal College of Physicians, London.
authors: A G
authors: AG
authors: Whitfield
authors: R
authors: R
authors: Bayliss
authors: C
authors: C
authors: Clarke
mesh_terms: D000293:Adolescent; D002423:Cause of Death; D002648:Child; D002675:Child, Preschool; D004739:England; D005260:Female; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D008297:Male; D009026:Mortality; D012737:Sex Factors; D014852:Wales