Risk stratification of patients with nodal involvement in upper tract urothelial carcinoma: Value of lymph-node density

Christian Bolenz, Shahrokh F. Shariat, Mario I. Fernández, Vitaly Margulis, Yair Lotan, Pierre Karakiewicz, Mesut Remzi, Eiji Kikuchi, Richard Zigeuner, Alon Weizer, Francesco Montorsi, Karim Bensalah, Christopher G. Wood, Marco Roscigno, Cord Langner, Theresa M. Koppie, Jay D. Raman, Shuji Mikami, Maurice Stephan Michel, Philipp Ströbel