Additional file 1.
Gross Domestic Product per capita (US $) and Mobile Phone Subscriptions per capita for selected countries. Data obtained directly from Reference . U.S. dollar figures obtained by applying average annual exchange rates from the International Monetary Fund (IMF) to the national currency for that year. Where such rates were unavailable, a World Bank or United Nations conversion rate was used.
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Kaplan Globalization and Health 2006 2:9 doi:10.1186/1744-8603-2-9