Sources of funding
The study was funded by the Fetal Medicine Foundation (Registered
charity No. 1037116). The reagents and equipment for the measurement of
serum placental growth factor and soluble fms-like tyrosine kinase-1
were provided by Thermo Fisher Scientific. These bodies had no
involvement in the study design; in the collection, analysis and
interpretation of data; in the writing of the report; and in the
decision to submit the article for publication.