same source bias
相同源偏差
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Comparing winners and also-rans from within the same countries, to avoid yet another source of bias, Dr Rablen and Dr Oswald found that the winners lived, on average, two years longer than those who had merely been nominated.
ECONOMIST: Is two years extra life
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