ABO blood groups and sex ratio at birth.
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn / Q000097:blood; D036801:Parturition; D012727:Sex Characteristics; D012744:Sex Ratio
D000017:ABO Blood-Group System; D001789:Blood Group Antigens
BLOOD GROUPS; INFANT, NEWBORN/blood in; SEX CHARACTERISTICS
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