1. World Health Organization. Prevalence and Incidence of Selected Sexually Transmitted Infections. (World Health Organization, Geneva, 2011).
2. Dean, D. in Duane's Foundations of Clinical Ophthalmology (eds. Tasman, W. & Jaeger, E.A.) 1–20 (Lippincott Williams & Wilkins, Philadelphia, 2002).
3. Harris, S.R. et al. Nat. Genet. 44, 413–419 (2012).
4. Stephens, R.S. et al. Science 282, 754–759 (1998).
5. Dean, D. et al. Emerg. Infect. Dis. 15, 1385–1394 (2009).