1. US Department of Health and Human Services, Centers for Disease Control and Prevention 1998 Assisted Reproductive Technology Success Rates: National Summary and Fertility Clinic Reports <
http://www.cdc.gov/nccdphp/drh/art98
> (2001).
2. Society for Assisted Reproductive Technology and the American Society for Reproductive Medicine. Assisted reproductive technology in the United States: 1998 results generated from the American Society for Reproductive Medicine/Society for Assisted Reproductive Technology registry. Fertil. Steril. 77, 18–31 (2002).
3. Nygren, K.G. & Andersen, A.N. Hum. Reprod. 16, 2459–2471 (2001).
4. Abma, J., Chandra, A., Mosher, W., Peterson, L. & Piccinino, L. Vital Health Stat. 23, 1–114 (1997).
5. Stern, Z., Laufer, N., Levy, R., Ben-Shushan, D. & Mor-Yosef, S. Israel J. Med. Sci. 31, 492–496 (1995).