Affiliation: | 1. Department of Clinical Biochemistry, Statens Serum Institut, Copenhagen, Denmark;2. Prenatal Screening Unit, Clinical Biochemistry Department, Harold Wood Hospital, Romford, UK;3. Department of Clinical Biochemistry, Statens Serum Institut, Copenhagen, Denmark Institute of Molecular Pathology, University of Copenhagen, Denmark;4. Institute of Molecular Pathology, University of Copenhagen, Denmark |