1. ART committee. Korean Society of Obstetrics and Gynecology. Current status of assisted reproductive technology in Korea, 2006. Korean J Obstet Gynecol. 2009. 52:1212–1238.
2. Cunningham FG, Leveno KJ, Bloom SL, Hauth JC, Gillstrap LC III, Wenstrom KD. Williams Obstetrics. 2005. 22nd ed. New York: McGraw-Hill.
3. Centers for Disease Control and Prevention. American Society for Reproductive Medicine. Society for Assisted Reproductive Technology. 2007 Assisted Reproductive Technology Success Rates: National Summary and Fertility Clinic Reports. 2009. Atlanta (US): Department of Health and Human Services, Centers for Disease Control and Prevention.
4. Nyboe Andersen A, Goossens V, Bhattacharya S, Ferraretti AP, Kupka MS, de Mouzon J, et al. Assisted reproductive technology and intrauterine inseminations in Europe, 2005: results generated from European registers by ESHRE: ESHRE. The European IVF Monitoring Programme (EIM), for the European Society of Human Reproduction and Embryology (ESHRE). Hum Reprod. 2009. 24:1267–1287.