http://www.stumbleupon.com/s/#5tVqDO/www.ncbi.nlm.nih.gov/pubmed/19676146?ordinalpos=2&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum/
Interesting observational study. Good example that these studies can be useful to form opinions for the purpose of testing via an intervention study, but cannot be used to determine causality. In this case, though, interesting counter intuitive information about the supposedly well known causes of cancer.
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