1. Committee on Understanding Premature Birth and Assuring Healthy Outcomes. Preterm birth: causes, consequences, and prevention,2006
2. Births: final data for 2007;Martin;Natl Vital Stat Rep,2010
3. Estimated effect of 17 alpha-hydroxyprogesterone caproate on preterm birth in the United States;Petrini;Obstet Gynecol,2005
4. Care for women with prior preterm birth;Iams;Am J Obstet Gynecol,2010
5. Progesterone and the risk of preterm birth among women with a short cervix;Fonseca;N Engl J Med,2007