Treatment of recurrent malignant sacrococcygeal germ cell tumors: analysis of 22 patients registered in the German protocols MAKEI 83/86, 89, and 96. - Schneider,D.T.; Wessalowski,R.; Calaminus,G.; Pape,H.; Bamberg,M.; Engert,J.; Waag,K.; Gadner,H.; Göbel,U. (J Clin Oncol, 2001)