这些操作需要引入对比剂和导管来明确目标，在此之前这些患者仅能从ERCP介入操作中获益。
These patients will only benefit from ERCP interventions when the goal of this procedure has been previously clearly defined before introduction of contrast and catheters.
方法通常包括利用导管装置，将一种或多种物质引入一个或多个盘中。
Methods generally involve introducing one or more substances into one or more discs using a catheter device.
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