Perbedaan rasio sela iga pada Opasitas Total Hemitoraks Kanan Atas oleh Pneumonia, Atelektasis, dan Massa di Computed Tomography Scan Toraks dan Radiografi Toraks = Intercostal Distance Ratio Differences between Right Upper Lobe Total Opacity Caused by Pneumonia, Atelectasis, and Mass in Chest Computed Tomography Scan and Radiography.