[Contribution to the statistical study of the sex of premature infants].
D001771:Blood Banks; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007234:Infant, Premature / Q000706:statistics & numerical data*; D012727:Sex Characteristics
BLOOD BANKS; INFANT, PREMATURE/statistics; SEX CHARACTERISTICS
Contribución al estudio estadistico del sexo de los prematuros.