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Cell-free DNA levels in pregnancies at risk of sickle-cell disease and significant ethnic variation.
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Br J Haematol 2006;135:738-41. -
Umbilical cord hematoma associated with an umbilical cord cyst and fetal death at 28 weeks of gestation.
Brown R, Nicolaides K.
J Ultrasound Med 2000;19:223-225.