1. The course of life of the patients who undergo infertility treatments – the approach to the narrative: Shinshosha;Yasuda,2012
2. The aging of ova: Bungeishunjyu;Kawai,2013
3. The average age of Japanese women giving birth to their first child was above 30 in 2011.
4. In 1999, 69,019 cycles of in vitro fertilization pre-embryo transfer (IVF-ET) had been performed in Japan, with 11,929 babies born as a result; this equates to 1 in 100 live births. The number of facilities performing IVF-ET has increased annually, reaching 423 in 1999.
5. Guideline of Japan Society of Obstetrics and Gynecology—The number of institutions that have performed or registered IVF-ET,2000