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http://www.pbs.org/newshour/rundown/modern-society-worsen-allergies-asthma-ask-… Summary
Prof. Carole Ober, Assoc. Prof. Anne Sperling find lower rates of asthma in Amish communities
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Prof. Carole Ober, Assoc. Prof. Anne Sperling find lower rates of asthma in Amish communities
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