Smith-Bindman, R.; Hosmer, W.; Feldstein, V. A.; Deeks, J. J.; Goldberg, J. D. (Feb 28, 2001). "Second-trimester ultrasound to detect fetuses with Down syndrome: a meta-analysis". JAMA. 285 (8): 1044–1055. doi:10.1001/jama.285.8.1044. PMID11209176.
Ozgen, Heval; Hellemann, Gerhard S.; Stellato, Rebecca K.; Lahuis, Bertine; Van Daalen, Emma; Staal, Wouter G.; Rozendal, Marije; Hennekam, Raoul C.; Beemer, Frits A.; Van Engeland, Herman (Jan 2011). "Morphological features in children with autism spectrum disorders: a matched case-control study". Journal of Autism and Developmental Disorders. 41: 23–31. doi:10.1007/s10803-010-1018-7. PMID20473590.
Smith-Bindman, R.; Hosmer, W.; Feldstein, V. A.; Deeks, J. J.; Goldberg, J. D. (Feb 28, 2001). "Second-trimester ultrasound to detect fetuses with Down syndrome: a meta-analysis". JAMA. 285 (8): 1044–1055. doi:10.1001/jama.285.8.1044. PMID11209176.
Ozgen, Heval; Hellemann, Gerhard S.; Stellato, Rebecca K.; Lahuis, Bertine; Van Daalen, Emma; Staal, Wouter G.; Rozendal, Marije; Hennekam, Raoul C.; Beemer, Frits A.; Van Engeland, Herman (Jan 2011). "Morphological features in children with autism spectrum disorders: a matched case-control study". Journal of Autism and Developmental Disorders. 41: 23–31. doi:10.1007/s10803-010-1018-7. PMID20473590.