1. Treating women of advanced reproductive age;MV,1998
2. Assisted reproductive technology in the United States and Canada: 2003 results generated from the American Society for Reproductive Medicine/Society for As
3. Effects of aging on fertility and pregnancy;Maroulis;Semin Reprod Endocrinol,1991
4. Some data on natural fertility;Henry;Eugenics,1961
5. Center for Disease Control and Prevention. 2003 Assisted Reproductive Technology (ART) Report. www.cdc.gov/ART/ART2003