1. Selective reduction: an unfortunate misnomer.;Berkowitz;Obstet Gynecol,1990
2. The changing pattern of multiple births in the United States: maternal and infant characteristics, 1973 and 1990.;Luke;Obstet Gynecol,1994
3. . Births: final data for 2010.;Martin;Natl Vital Stat Rep,2012
4. Epidemiology of twinning in developed countries.;Ananth;Semin Perinatol,2012
5. . Births: final data for 2012.;Martin;Natl Vital Stat Rep,2013