“…There are many previous researchers had proven that lead can affect the IQ at very low level. This statement was supported by most of the scientist especially from developed countries (Shamsul et al, 2005).…”
“…There are many previous researchers had proven that lead can affect the IQ at very low level. This statement was supported by most of the scientist especially from developed countries (Shamsul et al, 2005).…”
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