Perbedaan Keluaran Stenosis Arteri Tungkai pada Ultrasonografi (USG) yang Dioperasikan Trainee Bedah Vaskular Endovaskular Semester 1 dan Semester 4 Untuk Diagnosis Chronic Limb Threatening Ischemia (CLTI) dengan Standar Computed Tomography Angiogrphy (C = Differences in Limb Arterial Stenosis Outcomes on Ultrasonography (USG) Performed by First and Fourth Semester Vascular-Endovascular Surgery Trainees for the Diagnosis of Chronic Limb-Threatening Ischemia (CLTI) with Computed Tomography Angiography (CTA)