"we were quite surprised to find there were no significant differences," says study author
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elizabeth loder, md, professor of neurology, harvard medical school; chief, division of headache, brigham & women's hospital.
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twenty students and two teachers at mt maria college were sent to hospital
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the school in yarmouth that year had a low opt-out rate � 2 percent, the superintendent said � so there was a cap on the amount of disruption an illness could cause.
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