Erratum to: Urol Res DOI 10.1007/s00240-012-0464-4

As the given name and family name of the authors are represented incorrectly, the correct information regarding the author group is provided below:

Stefanos Kachrilas · Athanasios Papatsoris · Christian Bach · Stylianos Kontos · Zaman Faruquz · Anuj Goyal · Junaid Masood · Noor Buchholz