Distributions of selected variables in HNC cases and cancer-free controls.
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aTwo-sided χ2 test.b2 subjects were absent of smoking information and 2 subjects were absent of drinking information.cIncluding nasal sinuses, parotid and salivary gland.dIncluding adenocarcinoma, undifferentiated carcinoma and undetermined cancer.
创建时间：
2015-12-02
