title: Reply.
authors.affiliation: Harris Birthright Research Centre for Fetal Medicine, King's College London, London SE5 9RS, United Kingdom. Electronic address: kypros@fetalmedicine.com.
authors.forename: Kypros H
authors.initials: KH
authors.lastname: Nicolaides
mesh_terms: D005260:Female; D006801:Humans; D010570:Pessaries; D011247:Pregnancy; D059285:Pregnancy, Twin; D047928:Premature Birth / Q000517:prevention & control*