Naslund MJ, Gilsenan AW, Midkiff KD, Bown A, Wolford ET, Wang A. Prevalence of lower urinary tract symptoms and prostate enlargement in the primary care setting. Int J Clin Pract. 2007 Sep 1;61(9):1437-45.
Skriver MV, Pedersen L, Stang P, Lund L, Rothman KJ, Sorensen HT. The month of birth does not affect the risk of hypospadias. Eur J Epidemiol. 2004 Dec 1;19(12):1135-6.