Is there anybody who has worked to estimate the unmet need of particular services? I am thinking specifically of our aboriginal people who live in remote areas where dialysis is not readily available. Renal failure is common in this collective and obviously given the remoteness, diabetes as well as renal failure are vastly underdiagnosed, but also the treatment for renal failure (if culturally appropriate at all) in native patients of any country is not always given. I wonder if people have experience quantifying the 'unmet need'. i am aware of studies where investigators have looked at death certificates issued after patients in remote areas have died, but also these are non-specific as they often crudely list some known morbidites. How do we measure 'unmet need'?