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Forest plots for (A) X-ray exposure time compared between MTD and OSD, (B) access time compared between MTD and OSD, (C) X-ray exposure time compared between MTD and BD and (D) X-ray exposure time compared between BD and OSD. BD, balloon dilation; MTD, metal telescopic Alken type dilation; OSD, one-shot dilation; IV, inverse variance; SD, standard deviation; df, degrees of freedom.
