title: In reply.
authors.affiliation: University Hospitals Leuven, Leuven, Belgium Medical University Graz, Graz, Austria Inselspital, Bern, Switzerland Saint Peter's University Hospital, New Brunswick, New Jersey Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada University Medical Centre, Utrecht, The Netherlands Mount Sinai Hospital, Toronto, Ontario, Canada.
authors.forename: Tim
authors.initials: T
authors.lastname: Van Mieghem
authors.forename: Philipp
authors.initials: P
authors.lastname: Klaritsch
authors.forename: Luigi
authors.initials: L
authors.lastname: Raio
authors.forename: Angela C
authors.initials: AC
authors.lastname: Ranzini
authors.forename: David
authors.initials: D
authors.lastname: Baud
authors.forename: Jon
authors.initials: J
authors.lastname: Barrett
authors.forename: Roel
authors.initials: R
authors.lastname: De Heus
authors.forename: Greg
authors.initials: G
authors.lastname: Ryan
mesh_terms: D000013:Congenital Abnormalities; D036861:Delivery, Obstetric; D005260:Female; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000453:epidemiology*; D059285:Pregnancy, Twin / Q000706:statistics & numerical data*; D014430:Twins, Monozygotic / Q000706:statistics & numerical data*