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Williams says the differences may come down to the source of the mercury.
They were also about three times more likely to be flagged by their teachers as having these symptoms of ADHD.
See an authoritative Mayo Clinic Paper at polycarp.
What sets these kids apart is the degree and frequency with which they are hyper and impulsive, says George DuPaul, PhD, professor of school psychology and chairman of Lehigh Universitys education department.