作者单位:Department of Urology, Nephrological Center Niedersachsen, Hannoversch Muenden, Germany[1]Department of Urology, Duesseldorf University Hospital, Duesseldorf, Germany[2]Department of Urology, Academic Hospital Kassel GmbH, Kassel, Germany[3]Department of Urology, Duesseldorf University Hospital, Moorenstrasse 5, 40225 Düsseldorf, Germany[4]