1. Births: final data for 2008;Martin;Natl Vital Stat Rep,2010
2. Preterm birth: causes, consequences, and prevention;Behrman,2007
3. Race and ethnic disparities in fetal mortality, preterm birth, and infant mortality in the United States: an overview;MacDorman;Semin Perinatol,2011
4. Prematurity Research Expansion and Education for Mothers who deliver Infants Early Act (PREEMIE Act); 2006. [Available from: http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=109_cong_public_laws&docid=f:publ450.109].
5. Surgeon general’s conference on the prevention of preterm birth; 2008. [Available at http://www.surgeongeneral.gov/library/preterm_birth/background.html].