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Orthogonal partial least-squares-discrimination analysis (OPLS-DA) and permutation test results of LC, LBT, and HC (LC, laryngeal cancer patients; LBT, laryngeal benign tumor patients; HC, healthy crowds). OPLS-DA model of HC and LBT (A), LBT and LC (C), HC and LC (E). Permutation test results of HC and LBT (B), LBT and LC (D), HC and LC (F).
