What re­search can be done

Daily Local News (West Chester, PA) - - BUSINESS -

Two other kinds of re­search are pos­si­ble. Nei­ther of them, though, can con­clu­sively prove some­thing causes cancer. One looks back in time, af­ter an ill­ness has oc­curred. It com­pares two groups of peo­ple, one with the ill­ness,

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