Efek Bystander dan Abscopal pada Spatially Fractionated Grid Radiotherapy (SFGRT): Studi Menggunakan Babi Domestik (Sus scrofa domesticus) dengan Karsinoma Sel Hati = Bystander and Abscopal Effects in Spatially Fractionated Grid Radiotherapy: A Study Using Domestic Swine (Sus scrofa domesticus) with Hepatocellular Carcinoma