Trisomy 18 References
    
        
        
            
        
            Borenstein M, Persico N, Strobl I, et al. Frontomaxillary and mandibulomaxillary facial angles at 11 + 0 to 13 + 6 weeks in fetuses with trisomy 18. Ultrasound Obstet Gynecol. 2007 Nov 1. 
  Centre for Genetics Education. 
  Genetics Home Reference... 
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