1. Maternal age-specific rate of 47, + 21 and other cytogenetic abnormalities diagnosed in the first trimester of pregnancy in chorionic villus biopsy specimens: comparison with rates expected from observations at amniocentesis;Hook;American Journal of Human Genetics,1988
2. Maternal age-specific risk for trisomies at 9-14 weeks gestation;Snijders;Prenatal Diagnosis,1994
3. Maternal age- and gestation-specific risk for trisomy 21;Snijders;Ultrasound in Obstetrics and Gynecology,1999
4. Trisomy recurrence: a reconsideration based on North American data;Warburton;American Journal of Human Genetics,2004
5. Cytogenetic studies in couples experiencing repeated pregnancy losses;De Braekeleer;Human Reproduction,1990