Dr Martha Linet, the head of radiation epidemiology at the us National Cancer Institute, has looked at the same research as Carpenter but has reached a different conclusion.

美国国立癌症研究所的辐射列病学主任Martha Linet博士也曾做过与Carpenter教授一样的研究，但得出的结论却不同。

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That fourth-place finish came at last month's Great Edinburgh International, a race won by another 19-year-old sensation, Kenya's Linet Masai.

BBC: 'New Paula' targets gold in 2012

Last year, Ethiopian athlete Haile Gebrselassie won the men's race for a fifth time, while the women's race was won by Kenyan Linet Masai.

BBC: Fabrice Muamba to start Great Manchester Run