title: Always ask why!
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Sidney Kimmel Medical College of Thomas Jefferson University, Philadelphia, PA. Electronic address: vincenzo.berghella@jefferson.edu.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Berghella
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Sidney Kimmel Medical College of Thomas Jefferson University, Philadelphia, PA.
authors.forename: Rupsa C
authors.initials: RC
authors.lastname: Boelig
mesh_terms: D004965:Estrogen Antagonists / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D006908:Hydroxyprogesterones / Q000627:therapeutic use*; D011247:Pregnancy; D047928:Premature Birth / Q000517:prevention & control*
chemical_list: D004965:Estrogen Antagonists; D006908:Hydroxyprogesterones