求翻译：Mammograms that were positive for a malignant mass on or before 1996 were collected from five breast screening clinics是什么意思？

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Mammograms that were positive for a malignant mass on or before 1996 were collected from five breast screening clinics

问题补充：

匿名	2013-05-23 12:21:38 null

匿名	2013-05-23 12:23:18 乳房X线照片,都是积极的恶性大规模收集了关于1996年或以前从五乳房检查诊所

匿名	2013-05-23 12:24:58 正在翻译，请等待...

匿名	2013-05-23 12:26:38 从五个乳腺癌筛查诊所收集了恶性质量或 1996 年以前为阳性的乳房

匿名	2013-05-23 12:28:18 null

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