date:Jan 23, 2013
Study of Asthma and Allergies in Childhood (ISAAC), which involves nearly two million children in more than 100 countries, making it the biggest of its kind, The Guardian reported.
The study involved a relatively small portion of the total number of children taking part in ISAAC, from two age groups: 319,000 13 to 14-year-olds from 51 countries and 181,000 six to seven-year-olds from 31 countries.
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