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As some of the posts have indicated it is very difficult to establish a causal relationship between a certain disease and a specific cause. Let me remind everybody of the situation where there was suspicion of a connection between power line radiation and Leukemia. This connection has been debunked but one still sees articles about it. (The debunking was an extremely expensive effort and took many years). In the case of the power line radiation researchers thought they observed clusters but in fact the clusters were simple probabilistic events. So in the case of TCE or insecticides establishing a causal connection between those chemicals and a specific disease is difficult and usually very tedious. For TCE it is more likely that there is a connection between it and cancer. Some chlorinated hydrocarbons have been found to be carcinogenic. The bottom line is: Avoid jumping to conclusions, even though a as victim of a certain disease it is very tempting to do so. ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn