1. F. K. is in the Department of Urology, Charité Medical School, Humboldt University Berlin, Germany ().
2. J. K. is in the Department of Minimally Invasive Surgery (MIC), University Tuebingen, Germany.
3. H. S. is in the Laser-Forschungslabor, Department of Urology, Clinics of the University of Munich-Grosshadern, Germany.