1. Gnoth C, Godehardt E, Frank-Hermann P. Definition and prevalence of subfertility and infertility. Hum Reprod Update. 2005;20(5):1144–7.
2. World Health Organization. Reproductive health indicators for global monitoring: Report of the second interagency meeting, 2001. Geneva: World Health Organization; 2001: 23.
3. National Institute for Clinical Excellence. Fertility: assessment and treatment for people with fertility problems. London: NICE; 2004. p. 7–10.
4. Mascarenhas MN, Flaxman SR, Boerma T, Vanderpoel S, Stevens GA. National, regional, and global trends in infertility prevalence since 1990: a systematic analysis of 277 health surveys. PLoS Med. 2012;9(12):e1001356.
5. Streda R, Mardesic T, Kult D, Lazarovská S, Slámová J, Voboril J. The diagnostic value of hysterosalpingography in the diagnosis of tubal disease. Ceska Gynekol. 2009;74(1):18–21.