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Use of video-assisted thoracoscopic surgery (VATS) and open decortication (OD) for cases of pleural empyema according to year of the study. Each bar represents the relative percentage of cases performed using the VATS approach (white bar) or the open approach (black bar). It is noteworthy that the number of VATS cases performed tended to increase over time, whereas those using OD demonstrated a steady decline.
