[...]if a reliable national database of diabetes does not exist, other - potentially less reliable - approaches must be used, including 1) hospital discharge coding, which has traditionally been flawed by underrecording of diabetes but is improving with increased awareness of the contribution made by diabetes to the disease burden of all nations, and 2) the study of particular communities, with populations selected by health care provider or insurance/reimbursement scheme (Medicare, Veterans Health Administration [VHA], etc.) or by locality (4-7). There is no equivalent nationwide information reported from other developed countries, and available data are derived from particular patient groups. [...]the incidence of major amputation affecting patients in the VHA in 2004 was 1.59/ 1,000 person-years (10), even though the population selected was restricted to those undergoing their first lower-limb amputation.
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