In subgroup analysis, non-smokers with small tumors (T1–T2) showed a higher occurrence of lymph node metastases compared with smokers; however, this difference did not reach statistical significance (OR 1.88, 95% CI 0.80–4.41, p = 0.14).
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Cervical Lymph Node Metastasis Patterns and Diagnostic Accuracy of Preoperative Staging in Oral Squamous Cell Carcinoma.
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