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Children aged 4 to 10 were at particular risk from exposure.
Cancer compensates, spreads in search for oxygen, researcher suggests.
But it's not appropriate for most people, researchers say.
Prenatal exposure linked to later lung dysfunction, researchers say.
Medical, veterinary experts offer prevention tips.
Mom of 3 notes less trepidation from kids, more choices from dentists.
Total cost of participating in a sport averages $381, results show.
Review found fewer excess pounds and complications with healthy diet vs. exercise.
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