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FIG 1. Schematic representation of neck levels I through IV for the classification of cervical lymph nodes. SMG, submandibular gland; DGM, digastric muscle; HB, hyoid bone; OHM, omohyoid muscle; SCMM, sternocleidomastoid muscle; TM, trapezius muscle; CCA, common carotid artery; CL, clavicle
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