title: Reply.
authors.affiliation: Oxford Fetal Medicine Unit, Department of Maternal and Fetal Medicine, Oxford Fetal Medicine Unit, The Women's Center, John Radcliffe Hospitals, Headley Way, Oxford OX3 9DU, United Kingdom. Electronic address: liv.knutzen@doctors.org.uk.
authors.forename: Liv
authors.initials: L
authors.lastname: Knutzen
authors.affiliation: Oxford Fetal Medicine Unit, Department of Maternal and Fetal Medicine, Oxford Fetal Medicine Unit, The Women's Center, John Radcliffe Hospitals, Headley Way, Oxford OX3 9DU, United Kingdom.
authors.forename: Lawrence
authors.initials: L
authors.lastname: Impey
mesh_terms: D000138:Acidosis / Q000175:diagnosis*; D005312:Fetal Blood / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration