title: Editorial.
authors.affiliation: Maternal and Fetal Medicine Section, University of Glasgow, Institute of Medical Genetics, Yorkhill, G38SJ, Glasgow, United Kingdom Tel.: +44 141 201 0657; fax: +44 141 357 4277.
authors.forename: Fiona
authors.initials: F
authors.lastname: Lyall
authors.affiliation: Nuffield Department of Obstetrics and Gynaecology, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom.
authors.forename: Ian
authors.initials: I
authors.lastname: Sargent