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2. Triplets and higher-order multiple births: time trends and infant mortality;Kiely;Am J Dis Child,1992
3. Assessing the cost of a “standard”: hospitalized bedrest in triplet pregnancy;Sholl;Am J Obstet Gynecol,1994
4. Vital statistics of the United States, 1989;United State Department of Health and Human Services,1993
5. Birth weight standards for triplets under modern obstetric care in the United States, 1984–1989;Elster;Obstet Gynecol,1991