The results confirm those of previous studies that found higher rates of asthma among American children compared with kids from other countries, and investigators have also reported similar differences in allergic diseases between immigrants and native-born citizens in Italy, Israel and Australia.

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These are much clearer effects than those found in previous studies.

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This finding is consistent with those of 18 experimental studies conducted by other researchers, none of which found any benefit from mandatory disclaimers.

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Of those studies that distinguish between types of taxes, corporate income taxes are found to be most harmful, followed by personal income taxes, consumption taxes and property taxes.

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Studies of the EITC expansions enacted in the 1980s and 1990s found those expansions induced more than half a million people to enter the labor force.

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Both studies, funded by the manufacturers, found the drugs to be effective in those populations.

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In fact, some studies have even found that their earnings differ little, if at all, from those of dropouts.

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Another of Dr Nicholson's studies has even found a measurable difference between people who say they like chocolate and those who are indifferent to it.

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