title: Reply: To PMID 23295976.
authors.forename: Steve N
authors.initials: SN
authors.lastname: Caritis
mesh_terms: D005260:Female; D005865:Gestational Age; D006801:Humans; D006908:Hydroxyprogesterones / Q000009:adverse effects*; D011247:Pregnancy; D059285:Pregnancy, Twin / Q000187:drug effects*; D047928:Premature Birth / Q000188:drug therapy*; D011372:Progestins / Q000009:adverse effects*
chemical_list: D006908:Hydroxyprogesterones; D011372:Progestins