title: The value of performing a dating scan on all women in antenatal screening for Down's syndrome and neural tube defects.
authors.affiliation: Department of Environmental and Preventive Medicine, Wolfson Institute of Preventive Medicine, St. Bartholomew's Hospital Medical College, London, UK.
authors.forename: N
authors.initials: N
authors.lastname: Wald
authors.forename: A
authors.initials: A
authors.lastname: Kennard