Randomized Phase III trial comparing retroperitoneal lymph node dissection with one course of bleomycin and etoposide plus cisplatin chemotherapy in the adjuvant treatment of clinical Stage I nonseminomatous testicular germ cell tumors: AUO trial AH 01/94 by the German testicular cancer study group: Albers P, Siener R, Krege S, Schmelz HU, Dieckmann KP, Heidenreich A, Kwasny P, Pechoel M, Lehmann J, Kliesch S, Köhrmann KU, Fimmers R, Weissbach L, Loy V, Wittekind C, Hartmann M, German Testicular Cancer Study Group, Department of Urology, Klinikum Kassel GmbH, Kassel, Germany