1. Births: final data for 2017;Martin;Natl Vital Stat Rep,2018
2. Fetal and perinatal mortality: United States, 2013;MacDorman;Natl Vital Stat Rep,2015
3. Infant mortality statistics from the 2013 period linked birth/infant death data set;Matthews;Natl Vital Stat Rep,2015
4. Contemporary risks of maternal morbidity and adverse outcomes with increasing maternal age and plurality;Luke;Fertil Steril,2007
5. QuickStats: percentage of live births by cesarean delivery, by plurality—United States, 1996, 2000, 2006;MMWR,2009