Distribusi dan Frekuensi Fraktur Maksilofasial Berdasarkan Usia, Jenis Kelamin, Etiologi Fraktur, Regio Fraktur, Derajat Keparahan Cedera Fasial, dan Lama Rawat Inap Pasien RSUPN Dr. Cipto Mangunkusumo Periode 2009-2013 = Distribution and Frequency of Maxillofacial Fracture Based on Age, Gender, Etiology, Fracture Region, Facial Injury Severity, and Length of Stay in Dr. Ciptomangunkusumo General Hospital Patients on 2009-2013