• 1
    Ventura SJ, Martin JA, Curtin SC, Mathews TJ. Births: final data for 1997. Natl Vital Stat Rep 1999;47: 194.
  • 2
    Keith L, Oleszezuk J. Iatrogenic multiple birth, multiple pregnancy and assisted reproductive technologies. Int J Gynaecol Obstet 1999;64: 1125.
  • 3
    Lynch A, McDuffie R, Murphy J, Faber K, Leff M, Orleans M. Assisted reproductive interventions and multiple birth. Obstet Gynecol 2001;97: 195200.
  • 4
    Agustsson T, Geirsson RT, Mires G. Obstetric outcome of natural and assisted conception twin pregnancies is similar. Acta Obstet Gynecol Scand 1997;76: 4549.
  • 5
    Bernasko J, Lynch L, Lapinski R, Berkowitz RL. Twin pregnancies conceived by assisted reproductive techniques: maternal and neonatal outcomes. Obstet Gynecol 1997;89: 368372.
  • 6
    Daniel Y, Ochshorn Y, Fait G, Geva E, Bar-Am A, Lessing JB. Analysis of 104 twin pregnancies conceived with assisted reproductive technologies and 193 spontaneously conceived twin pregnancies. Fertil Steril 2000;74: 683689.
  • 7
    Dhont M, De Sutter P, Ruyssinck G, Martens G, Bekaert A. Perinatal outcome of pregnancies after assisted reproduction: a case-control study. Am J Obstet Gynecol 1999;181: 688695.
  • 8
    Fitzsimmons BP, Bebbington MW, Fluker MR. Perinatal and neonatal outcomes in multiple gestations: assisted reproduction versus spontaneous conception. Am J Obstet Gynecol 1998;179: 11621167.
  • 9
    Koudstaal J, Bruinse HW, Helmerhorst FM, Vermeiden JP, Willemsen WN, Visser GH. Obstetric outcome of twin pregnancies after in-vitro fertilization: a matched control study in four Dutch university hospitals. Hum Reprod 2000;15: 935940.
  • 10
    Lambalk CB, van Hooff M. Natural versus induced twinning and pregnancy outcome: a Dutch nationwide survey of primiparous dizygotic twin deliveries. Fertil Steril 2001;75: 731736.
  • 11
    Luke B, Anderson E, Misiunaset al. Do outcomes differ in spontaneous vs. assisted-conceived twins? Society for Maternal Fetal Medicine New Orleans January 2002. Am J Obstet Gynecol 2001;185(6, Suppl):S7.abstract
  • 12
    Minakami H, Sayama M, Honma Y, et al. Lower risks of adverse outcome in twins conceived by artificial reproductive techniques compared with spontaneously conceived twins. Hum Reprod 1998;13: 20052008.
  • 13
    Moise J, Laor A, Armon Y, Gur I, Gale R. The outcome of twin pregnancies after IVF. Hum Reprod 1998;13: 17021705.
  • 14
    Zuppa AA, Maragliano G, Scapillati ME, Crescimbini B, Tortorolo G. Neonatal outcome of spontaneous and assisted twin pregnancies. Eur J Obstet Gynecol Reprod Biol 2001;95: 6872.
  • 15
    Minakami H, Honma Y, Matsubara S, Uchida A, Shiraishi H, Sato I. Effects of placental chorionicity on outcome in twin pregnancies. A cohort study. J Reprod Med 1999;44: 595600.
  • 16
    Dube J, Dodds L, Armson BA. Does chorionicity or zygosity predict adverse perinatal outcomes in twins. Am J Obstet Gynecol 2002;186: 579583.
  • 17
    Lumley J. The prevention of preterm birth: unresolved problems and work in progress. Aust Paediatr J 1988;24: 101111.
  • 18
    Goldenberg RL, Mayberry SK, Copper RL, Dubard MB, Hauth JC. Pregnancy outcome following a second-trimester loss. Obstet Gynecol 1993;81: 444446.
  • 19
    Hack M, Friedman H, Fanaroff AA. Outcomes of extremely low birth weight infants. Pediatrics 1996;98: 931937.
  • 20
    Hack M, Flannery DJ, Schluchter M, Cartar L, Borawski E, Klein N. Outcomes in young adulthood for very-low-birth-weight infants. N Engl J Med 2002;346: 149157.
  • 21
    Lynch A, McDuffie R, Jr Murphy J, Faber K, Orleans M. Preeclampsia in multiple gestation: the role of assisted reproductive technologies. Obstet Gynecol 2002;99: 445451.
  • 22
    Min SJ, Luke B, Gillespie B, et al. Birth weight references for twins. Am J Obstet Gynecol 2000;182(5):12501257.May
  • 23
    Schieve LA, Meikle SF, Ferre C, Peterson HB, Jeng G, Wilcox LS. Low and very low birth weight in infants conceived with use of assisted reproductive technology. N Engl J Med 2002;346: 731737.
  • 24
    Benirschke K. Multiple gestation: incidence, etiology and inheritance. In: CreasyRK, ResnikR editors. Maternal Fetal Medicine, 4th edition. Philadelphia , Pennsylvania : WB Saunders, 1999: 585592
  • 25
    Tanbo T, Dale PO, Lunde O, Moe N, Abyholm T. Obstetric outcome in singleton pregnancies after assisted reproduction. Obstet Gynecol 1995;86: 188192.