But so far, improvement in vision has persisted as long as two years after a single treatment without evidence of significant adverse side effects.

但到目前为止，在经过一次性治疗后，病人视觉的改善最长已经维持了两年时间，没有证据显示出现了明显的不良副作用。

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Between 2001 and 2003, the patients received up to three perfusions of islet cells, so long as islet function persisted after the preceding transplantation.

在2001年到2003年之间，胰岛功能在前一次移植后能够维持的患者接受了多达3次的胰岛细胞移植。

youdao

Between 2001 and 2003, the patients received up to three perfusions of islet cells, so long as islet function persisted after the preceding transplantation.

在2001年到2003年之间，胰岛功能在前一次移植后能够维持的患者接受了多达3次的胰岛细胞移植。

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