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health income inequality country model visit effect economic class individual inequity index result measure specialist panel doorslaer variable health care sample european journal specialist visits indices jones / journal number table regression estimate concentration index utilisation approach contribution income-related status concentration level probability analysis value employment method interval labour hurdle van doorslaer factor portugal health care use distribution category heterogeneity household paper health care utilisation variation region difference prediction non-need education survey health inequality 2004 john wiley group ireland hazard netherland di fferences evidence greece gp visits health status income-related health inequality austria health limitations blackwell publishing ltd verein fur socialpolitik signi retirement