Crean, St-John Reduction of occult metastatic disease by extension of the supraomohyoid neck dissection to include level IV. [electronic resource] - Head & neck Sep 2003 - 758-62 p. digital Publication Type: Journal Article ISSN: 1043-3074 Standard No.: 10.1002/hed.10282 doi Subjects--Topical Terms: Carcinoma--pathologyFemaleHumansLymphatic MetastasisMaleMiddle AgedMouth Neoplasms--pathologyNeck Dissection--methodsNeoplasm Staging