Harvard's Global Burden of Disease Unit exists within the Center for Population and Development Studies in Harvard's School of Public Health.
Here is the link to the summary of ch. 1, which deals with the problems they are trying to cope with regarding data.
http://www.hsph.harvard.edu/organizations/bdu/gbdsum/gbdsum1.pdf
If you wish to read more, use your backspace to go to the gbdsum (whole study), and further to bdu/ to learn more about the Unit.
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