The optimal surgical volume for anorectal melanoma: a retrospective analysis of the Russian Colorectal Cancer Society registry von Gordeev, S. S., Rybakov, E. G., Каrachun, A. M., Кaushanskiy, V. B., Tsapko, K. A., Samsonov, D. V., Маmedli, Z. Z., Stilidi, I. S.

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