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Communications : Nassim Taherian, B. Sc., « Ultrasound screening of fetuses at increased risk for Down syndrome: How many missed diagnoses? » Ref: Caughey et al., Prenatal Diagnosis 26(1): 22-27, 2006. Teresa Tiberg, B. Sc.,« Stickler syndrome: Clinical characteristics and diagnostic criteria. » Ref: Am. J. Med. Genet. 138A: 199-207, 2005.