title: Reply: Extended culture and the risk of preterm delivery in singletons: confounding by indication?
authors.forename: Shir
authors.initials: S
authors.lastname: Dar
authors.forename: Gunby
authors.initials: G
authors.lastname: Joanne
authors.forename: Clifford L
authors.initials: CL
authors.lastname: Librach
mesh_terms: D004624:Embryo Transfer / Q000379:methods*; D005260:Female; D006801:Humans; D011247:Pregnancy; D047928:Premature Birth / Q000453:epidemiology*; D012042:Registries