Rina Anggraeni; Muhammad Irsal; Shinta Gunawati Sutoro; Mahfud Edy Widiatmoko; Asumsie Tarigan; Fitrus Ardoni; Nursama Heru Apriantoro. THE EFFECT OF USING 4 POINTS LOCKS AND 9 POINTS LOCKS MASKS ON PATIENT SET-UP IN NASOPHARYNX CANCER. IPR 2023, 7, 1-9.