Financing, Personal -- economics : Medical care economic risk : measuring financial vulnerability from spending on medical care / Panel on Measuring Medical Care Risk in Conjunction with the New Supplemental Income Poverty Measure ; Michael J. O'Grady and Gooloo S. Wunderlich, editors ; Committee on National Statistics, Division of Behavioral and Social Sciences and Education, Board on Health Care Services, National Research Council and Institute of Medicine of the National Academies