1. Department of Urology, Ministry of Health, Yozgat State Hospital, Yozgat, Turkey.
2. Department of Urology, Ankara State Hospital, University of Health Sciences School of Medicine, Ankara, Turkey.
3. Department of Urology, Balikesir University School of Medicine, Balikesir, Turkey.
4. Department of Urology, Ministry of Health, Etimesgut Sehit Sait Erturk State Hospital, Ankara, Turkey.
5. Department of Biostatistics, Hacettepe University School of Medicine, Ankara, Turkey.