Analisis Hubungan Pola Invasi, Invasi Limfatik, Vena, dan Saraf dengan Derajat Diferensiasi KSSRM: Studi pada Pasien KSSRM RSUPN Ciptomangunkusumo = Analysis of the Relationship Between Invasion Patterns, Lymphatic, Venous, and Nerve Invasion with the Degree of Differentiation in OSCC: A Study on OSCC Patients at RSUPN Cipto Mangunkusumo