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Meta‐analysis on the prevalence of molecular parameters HPV (A,B), p16 overexpression (C,D) and TP53 mutations (E,F) in head and neck squamous cell carcinoma of nonsmokers vs smokers (A,C,E) and nondrinkers vs drinkers (B,D,F). The presence of HPV and p16 overexpression were analyzed separately for oropharyngeal and nonoropharyngeal squamous cell carcinoma [Color figure can be viewed at wileyonlinelibrary.com]
