Some confusion has arisen over a slightly inaccurate reference in this article by Paul Abrams and Alan Wein (2 December, pp 1393-6). The article in reference 20 was published in a supplement to European Urology, called Curriculum in Urology 1.3, and not in the main journal, as was stated. The correct reference is: De Jong TPVM. Treatment of bladder exstrophy and epispadias. Eur Urol 1999;36(suppl):1-7.