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2. Position statement from the Aneuploidy Screening Committee on behalf of the Board of the International Society for Prenatal Diagnosis1. (21st May 2013)

3. Position statement from the Chromosome Abnormality Screening Committee on behalf of the Board of the International Society for Prenatal Diagnosis†‡. (4th June 2015)

5. Response to "On gestational weeks and maths". (December 2013)