1. Trends in fertility and contraception in the last quarter of the 20th century;Botting;Popul Trends,2000
2. Hilder L Zhichao Z Parker M Jahan S Chambers GH Australia's mothers and babies 2012 Canberra Australian Institute for Health and Welfare 2012
3. Childbearing beyond age 40: pregnancy outcome in 24,032 cases;Gilbert;Obstet Gynecol,1999
4. Advanced maternal age. Part I: obstetric complications;Usta;Am J Perinatol,2008
5. Increased maternal age and the risk of fetal death;Fretts;N Engl J Med,1995