Attention deficit hyperactivity disorder (ADHD) appears to be on the rise in the United States, and in the search for explanations researchers have begun to scrutinize fetal exposure to a wide range of toxins, including lead, tobacco, pesticides, and chemicals such as PCBs.
Source: http://rss.cnn.com/~r/rss/cnn_health/~3/JUZMkkkYSuA/index.html
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