One reason I can think of is, the CT image is not obvious.

來源: N. 於 2008-05-02 21:03:18 [] [舊帖] [給我悄悄話] 閱讀數 : (100 bytes)

That is, giving the CT image to 10 doctors, 5 might say there is cancer; the other 5 say no cancer.

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