The mean duration of follow-up was twenty-four months, and all patients with a minimum duration of follow-up of six months were included.

平均随访周期为24个月，全部至少已经随访6个月的患者均纳入本研究。

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China shall issue import licences for a minimum duration of validity of six months, except where exceptional circumstances make this impossible.

中国发放的进口许可证的有效期至少应为6个月，除非例外情况使此点无法做到。

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China shall issue import licences for a minimum duration of validity of six months, except where exceptional circumstances make this impossible.

中国发放的进口许可证的有效期至少应为6个月，除非例外情况使此点无法做到。

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