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it is amazing how many I've read about over the years - and of course there is no definitive answer on some of them....but clearly a few have a form of "placebo effect". It's a fun chapter to write....I am about half done with it. And of course I will be leaving myself wide open, because there will be a bit of deductive reasoning/logical cause and effect combined with whatever results I can find.
So I don't know about this specifically, but it is another point to add to my chapter (now off to do some research!)
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