Comment: the conversion ratio as a basis for elective neck node therapy.
D001706:Biopsy; D003657:Decision Making; D004724:Endoscopy; D006258:Head and Neck Neoplasms / Q000175:diagnosis / Q000532:radiotherapy / Q000628:therapy*; D006801:Humans; D008198:Lymph Nodes / Q000528:radiation effects*; D008207:Lymphatic Metastasis / Q000517:prevention & control*; D009062:Mouth Neoplasms / Q000175:diagnosis / Q000628:therapy*; D037981:Neck Dissection; D011379:Prognosis; D011879:Radiotherapy Dosage; D013997:Time Factors