> Causation causes correlation... Not commutative, I agree. Like a lot of things medical, the study's conclusions seem well out in front of the data - To me. Others will see differently. If I had to bet, it'd be we're both right - Sort of... Jack --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .