求翻译：Evidence suggests that MET using nifedipine, tamsulosin, doxazosin, or terazosin can be suggested as treatment for ureteral stones owing to its expulsive efficacy, pain reduction, and safety profile. No recommendation can be made concerning the superiority of either nifedipine or a-blockers. … There is some evidence that a combination of a-blockers and corticosteroids might be more effective than treatment with a-blockers alone. …Patients harbouring stones of up to 10 mm and eligible for observation may be offered MET. With increasing stone size >5 mm, the advantage of MET with a-blockers compared to a control group becomes emphasised. Although patients with ureteral stones >10 mm could be observed or treated with MET, no recommendation can be made at this point.是什么意思？

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