In 2002 an article entitled "Preterm Birth: A Continuing Challenge" noted that premature births are abnormally high in the United States, citing a study that observed that a previous abortion is a "risk factor for both infertility and preterm birth."<ref>Moore, M.L. (2002, Fall). [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1595132/ Preterm Birth: A Continuing Challenge]. ''The Journal of Perinatal Education'', 11(4), 37-40. doi: 10.1624/105812402X88948</ref> | In 2002 an article entitled "Preterm Birth: A Continuing Challenge" noted that premature births are abnormally high in the United States, citing a study that observed that a previous abortion is a "risk factor for both infertility and preterm birth."<ref>Moore, M.L. (2002, Fall). [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1595132/ Preterm Birth: A Continuing Challenge]. ''The Journal of Perinatal Education'', 11(4), 37-40. doi: 10.1624/105812402X88948</ref> |