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Development of tumor stages (a) and lymph node stages and other metastasis (b) at first diagnosis for penile cancer in Germany (2006–2016; 60% of the total population). N+, M+ lymph node and other metastasis, M+ other metastasis, lymph node-negative, N+ lymph node metastasis only, N0, M0 no metastasis, Nx, Mx metastasis unclear
