PERINATAL MORTALITY IN TWINS BY SEX.
D005260:Female; D005313:Fetal Death; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D054238:Perinatal Mortality; D011247:Pregnancy; D012723:Sex; D014427:Twins; D014481:United States
FETAL DEATH; INFANT MORTALITY; SEX; TWINS; UNITED STATES