You know what? I'm not sure ANY of these so called studies have been done at all. I think it's all just written up and then they estimate a large figure but make sure it's beliveable and then they go and print it. They know they're lying, because they're working it out - and the government arnt going to actually pay for these tests, because they know it's safe. They're more likely to keep our cash and shove it in their back pocket.