1. Fitzgerald O, Harris K, Paul R, Chambers GM; Assisted reproductive technology in Australia and New Zealand 2015. National Perinatal Epidemiology and Statistics Unit, Sydney. The University of New South Wales, Sydney, Australia. 2017 Oct; 4. npesu.unsw.edu.au. Accessed 4 December 2017.
2. Human Fertilisation and Embryology Authority (HFEA). Oocyte donation statistics. 2014. https://www.hfea.gov.uk/about-us/publications/. Accessed 4 December 2017.
3. Gunby J, Bissonnette F, Librach C, Cowan L. Assisted Reproductive Technologies (ART) in Canada: 2007 results from the Canadian ART register. Fertil Steril. 2011;5(2):542–7.
4. Sunderam S, Chang J, Flowers L, Kulkarni A, Sentelle G, Jeng G, Macaluso M. Assisted Reproductive Technology Surveillance - United States. JSTOR. 2006;58(5):1–25.
5. Zegers-Hochschild F, Schwarze JE, Crosby J, Musri C, Urbina MT, Latin American Network of Assisted Reproduction (REDLARA). Assisted reproduction techniques in Latin America: the Latin American Registry. Reprod Biomed Online. 2017;35(3):287–95.