A massive study of the global burden of disease has been published in the most recent issue of the Lancet (Horton 2012). It reports the mortality, causes of death, years lived with disability and disability-adjusted life years for 291 conditions in 21 regions taking into account 67 risk factors. Between 1990 and 2010 the world population has risen from 3.7 to 6.9 billion people.
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