1. Institute for Quality and Efficiency in Health Care (IQWiG); Dillenburger Str. 27 Cologne Germany 51105
2. Institute for Quality and Efficiency in Health Care (IQWiG); Department of Medical Biometry; Cologne Germany
3. General Hospital; Department of Urology; Viersen Germany
4. University Hospital; Department of Radiotherapy; Aachen Germany
5. University Hospital; Department of Urology; Aachen Germany