1. Gidwani, G. & Falcone, T. Congenital Malformations of the Female Genital Tract: Diagnosis and Management (Lippincott Williams & Wilkins, Philadelphia, 1999).
2. National, Cancer Institute. Surveillance, Epidemiology, and End Results (SEER) Program. [online], (cited 8 Oct. 2003), < http://www.seer.cancer.gov > (2003).
3. Paria, B. C., Reese, J., Das, S. K. & Dey, S. K. Deciphering the cross-talk of implantation: advances and challenges. Science 296, 2185–2188 (2002).
4. Couse, J. F. & Korach, K. S. Estrogen receptor null mice: what have we learned and where will they lead us? Endocr. Rev. 20, 358–417 (1999).
5. Feldhamer, G., Drickamer, L., Vessey, S. & Merritt, J. Mammalogy: Adaptation, Diversity, and Ecology (McGraw–Hill, New York, 2003).