They also have 23 percent more mobility limitations, such as trouble climbing stairs or walking a block.

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Future increases have also been authorized, with limitations.

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"The advice goes for both patient and doctor, including myself, to state up front what are our goals for the time we're spending together, also our expectations, and also to have an understanding of the time limitations we have going forward, " An said.

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While volunteer applications have also gone up over the last year, managers said funding limitations meant they could not all be taken on to offer the support many families say they need.

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"Whatever tool you use gives you creativity, you have to overcome its limitations, " said Anselme, who is also a musician and cabaret artist.

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Yet despite their limitations, slums are also a hive of business activity, full of cottage industries that have sprung up organically, without assistance from the local government, the banking sector, or any part of the formal economy.

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The research shows that social networks have a lot of promise for these types of surveys, and also that there are still some major limitations.

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