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3. The natural history of cytogenetically abnormal fetuses detected at midtrimester amniocentesis which are not terminated electively: New data and estimates of the excess and relative risk of late fetal death associated with 47,+21 and some other abnormal karyotypes;Hook;American Journal of Human Genetics,1989
4. Sex ratios in fetuses and liveborn infants with autosomal aneuploidy;Huether;American Journal of Medical Genetics,1996