Vélez, Nydia M., Inés E. García, Lourdes García, and Marta Valcárcel. “The Use of Illicit Drugs During Pregnancy Among Mothers of Premature Infants”. Puerto Rico Health Sciences Journal 27, no. 3 (July 22, 2008). Accessed December 18, 2025. https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/70.