title: Recruitment and retention of women in a large randomized control trial to reduce repeat preterm births: the Philadelphia Collaborative Preterm Prevention Project.
authors.affiliation: Department of Adolescent Medicine, Children's Hospital of Philadelphia, 3535 Market Street, Philadelphia, PA 19104, USA. WEBBD@email.chop.edu
authors.forename: David A
authors.initials: DA
authors.lastname: Webb
authors.forename: James C
authors.initials: JC
authors.lastname: Coyne
authors.forename: Robert L
authors.initials: RL
authors.lastname: Goldenberg
authors.forename: Vijaya K
authors.initials: VK
authors.lastname: Hogan
authors.forename: Irma T
authors.initials: IT
authors.lastname: Elo
authors.forename: Joan R
authors.initials: JR
authors.lastname: Bloch
authors.forename: Leny
authors.initials: L
authors.lastname: Mathew
authors.forename: Ian M
authors.initials: IM
authors.lastname: Bennett
authors.forename: Erika F
authors.initials: EF
authors.lastname: Dennis
authors.forename: Jennifer F
authors.initials: JF
authors.lastname: Culhane