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Nearly two-thirds of the increase in household wealth since 2009 is due to rising stock prices, the authors note.

NPR: Average US Household Far From Regaining Its Wealth

The authors note that financial barriers and access to health care account for some of the disparities in cancer screening rates, but that education levels, age, and length of residence in the U.S. for some immigrant subgroups also have an effect.

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This spending is discretionary, the authors note, because utilities can just switch to gas instead.

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The irony in this discussion, as the authors note, concerns how difficult it can be to reconcile the goals of microfinance.

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Mello believes that smoking could be regulated in public housing in the same way that drugs and alcohol are, but she and her co-authors note that penalties -- including eviction- may be hard to impose.

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The authors note that it is not yet known why women with AF are more susceptible to stroke.

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The study authors note that the majority of people flying out of Guinea, Liberia and Sierra Leone are traveling to other low- or middle-income countries.

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