Lubetkin and her co-author based their findings on a massive collection of data, covering 3.5 million people.

VOA: standard.2010.08.10

But technology expert Rob Atkinson says smartphones will most likely not be widely used in many developing nations because of their cost, and the cost of connected on-line data plans.

VOA: standard.2010.06.25

A lack of access to Cuba,says GAO, has made it difficult to obtain nationally representative data on audience size, and decision-makers have had limited information to assess the relative success or return on investment for each transmission method.

VOA: standard.2009.06.18