1. Crinone [Prescribing Information] Parsippany, NJ: Watson, Pharma,Inc; August 2013.
2. Endometrin [Prescribing Information] Parsippany, NJ: Ferring Pharmaceuticals Inc; February 2008.
3. Micromedex Healthcare Series [Internet database]. Greenwood Village, Colo: Thomson Reuterus (Healthcare). Updated periodically. Accessed July 8, 2015.
6. Hassan SS, Romero R, Vidyadhari D, et al. Vaginal progesterone reduces the rate of preterm birth in women with a sonographic short cervix: a multicenter, randomized, double-blind, placebo controlled trial. Ultrasound in Obstet Gynecoll 2011;38:18-31.
7. Fonseca EB, Celik E, Parra M, et al. Progesterone and the Risk of Preterm Birth among Women with a Short Cervix. NEJM. 2007;357:462-469.
8. DeFranco E, Obrien JM, Adair CD et al. Vaginal progesterone is associated with a decrease in risk for early preterm birth and improved neonatal outcome in women with a short cervix: a secondary analysis from a randomized, double-blind, placebo-controlled trial. Ultrasound Obstet Gynecol 2007;30:697-705.
9. Use of Progesterone to Reduce Preterm Birth; ACOG Committee Opinion No. 419. October 2008.
10. daFonseca EB, Bittar RE, Carvalho MHB et al. Prophylactic administration of progesterone by vaginal suppository to reduce the incidence of spontaneous preterm birth in women at increased risk: A randomized placebo-controlled double-blind study. Am J Obstet Gynecol 2003;188:419 - 424.
11. Norwitz E, Phaneuf L, Caughey Progesterone Supplementation and the Prevention of Preterm Birth. Obstetrics and Gynecology 2011 Summer; 4(2): 60-72.