title: Preconception ART and preterm birth: real effect or selection bias? - Authors' reply.
authors.affiliation: University of Pittsburgh, Pittsburgh, PA, USA; Stellenbosch University, Cape Town, South Africa; Johns Hopkins University, Baltimore, MD, USA. Electronic address: jbn16@pitt.edu.
authors.forename: Jean B
authors.initials: JB
authors.lastname: Nachega
authors.affiliation: McMaster University, Hamilton, ON L8S 4L8, Canada.
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Mills
authors.affiliation: Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK; Department of Public Health (IHCAR), Karolinska Institute, Stockholm, Sweden; Centre for Evidence-Based Health Care, Stellenbosch University, South Africa.
authors.forename: Olalekan A
authors.initials: OA
authors.lastname: Uthman
authors.affiliation: Department of HIV, WHO, Geneva, Switzerland.
authors.forename: Francoise
authors.initials: F
authors.lastname: Renaud
authors.affiliation: Elizabeth Glazer Pediatric AIDS Foundation, Washington DC, USA.
authors.forename: Lynne M
authors.initials: LM
authors.lastname: Mofenson
mesh_terms: D005260:Female; D015658:HIV Infections; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D047928:Premature Birth; D015983:Selection Bias