1. Births: final data for 2014.;Hamilton;Natl Vital Stat Rep,2015
2. Deaths: final data for 2014.;Kochanek;Natl Vital Stat Rep,2016
3. Deaths: final data for 2013.;Xu;Natl Vital Stat Rep,2016
4. Fetal and perinatal mortality: United States, 2013.;MacDorman;Natl Vital Stat Rep,2015
5. National Center for Health Statistics
. Natality Public Use File. Hyattsville, MD: National Center for Health Statistics. Published annually. Available at: www.cdc.gov/nchs/data_access/VitalStatsOnline.htm. Accessed November 10, 2015