http://onlinelibrary.wiley.com/doi/10.1111/j.1474-919x.2005.00427.x/abstract
This is another article, but it's an online one, which I think there is a hard copy in the library, and it's looking more at the statistics than the reasons behind it. I think, if I can find the journal this article is in so I can have a proper look and read of it, it would be good for the more technical side of my project, statistics and such.
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