Siavash Falahatkar1, Mojtaba Teimoori2. 1. Urology Research Center, Razi Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran. 2. Urology Research Center, Razi Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran. mojtaba_teimoori@yahoo.com.