Perinatal care at the threshold of viability.
D003376:Counseling; D005260:Female; D005328:Fetal Viability; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D019102:Infant, Very Low Birth Weight; D018743:Perinatal Care; D011247:Pregnancy; D015996:Survival Rate