http://www.eurekalert.org/pub_releases/2016-07/w-sec071916.php

Public Release: 19-Jul-2016
Surgical expenses cause financial catastrophe for millions each year
Wiley

According to an analysis of publicly available data from 186 countries, direct medical costs of surgery put an estimated 43.9 per cent of the world's population at risk of financial catastrophe and between 30.8 and 57.0 per cent at risk of falling below national and international poverty lines.

Direct medical expenditures on surgery will push approximately 30 million individuals into financial catastrophe and 11 million below their country's poverty line every year.

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