Preterm birth in the United States: the impact of stressful life events prior to conception and maternal age.
Witt, Whitney, Erika Cheng, Lauren Wisk, Kristin Litzelman, Debanjana Chatterjee, Kara Mandell, and Fathima Wakeel. 2014. “Preterm Birth in the United States: The Impact of Stressful Life Events Prior to Conception and Maternal Age.”. Am J Public Health 104 Suppl 1: S73-80.