title: References revisited.
authors: Sietske M
authors: SM
authors: Althuisius
authors: Pieter
authors: P
authors: Hummel
mesh_terms: D023802:Cerclage, Cervical; D005260:Female; D006801:Humans; D011247:Pregnancy; D009626:Terminology as Topic; D002581:Uterine Cervical Incompetence / Q000601:surgery*