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Diversification of study group in terms of primary tumor site location (a), sex (b), and histopathology (c). (a) Abbreviations: GU BP, genitourinary tract—bladder and/or prostate; GU non-BP genitourinary tract with the exception of the bladder and prostate; HN PM, head and neck—parameningeal region; HN non-PM, head and neck with the exception of the parameningeal region. (b) Abbreviations: M, male; F female.
