然而，尽管皮肤黑色的人中皮肤癌发病率较低，但癌症往往发现得比较晚，且已进入更加危险的阶段。

However, even though the incidence of skin cancer is lower in dark-skinned people, the cancers are often detected at a later, more dangerous stage.

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全球早产率数据是从之前针对1997年至2002年报告的已公布和未公布产妇死亡率和发病率数据进行的系统性评价得到。

Data on preterm birth rates worldwide were extracted during a previous systematic review of published and unpublished data on maternal mortality and morbidity reported between 1997 and 2002.

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秘鲁由于已实现这些目标和成功地降低发病率而被从最初一组负担沉重国家中排除。

Peru was excluded from the original group of high-burden countries, having met the targets and successfully reduced incidence.

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