因此，研究人员进行了一项病例对照研究，涉及2,690儿童癌症病例和4858匹配来自英国儿童癌症研究（UKCCS）控制。孩子们出生在1976年和1996年。
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Other parts of the UKCCS will be doing just that, using data taken from the same children.
BBC: Pylons safe, says 'definitive' research
Professor Nick Day, from the University of Cambridge, who led part of the UKCCS project, said the Bristol ideas were dubious.
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