Avoiding and then adjusting for any such bias, however, is at the heart of the work of the Oxford cancerepidemiology unit.
然而，避免和调整诸如此类的偏见是牛津大学癌症流行病学部门的工作核心。
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Researchers led by the Institute ofCancerEpidemiology in Copenhagen found cancer rates in the central nervous system were almost the same in both long-term mobile phone users and non-users.