International Journal of Impotence Research 2005; 17: 523–526. doi:10.1038/sj.ijir.3901350

The editor and the publisher wish to retract Nikoobakht et al. (http://www.nature.com/ijir/journal/v17/n6/abs/3901350a.html) due to dual publication. The original form of this paper appeared in the Urology Journal (2005; 2: 40–44).