I think they have too wide of a range. They're not concentrating on just one or two possible causes; they're doing everything. And in such a way, they're not going to be able to spend as much time or detail on one or two.
It also bothers me that they listed immunization records as something they want to collect. That myth should be dead and gone by now, but when studies like this - conducted by a university - happen, people see that and immediately react. Plus, if they see that many children reacted negatively to the shots, I'm afraid they won't think it's because of the autism; they'll think it caused the autism.
It also speaks badly of them that they mention that they think autism is more than one condition, and that there's actually several sub categories. Of course there is; it's a spectrum. The explanation of rises in dxs with trying to find what causes it? Unlikely to be related, since the newer studies show it's just as prevelant now as it was before. It appears to me that they didn't do much research, and that's poor of them.
Overall, I'm unimpressed.
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"Nothing worth having is easy."
Three years!