I believe it.
And it was posted before the first of april.
But then the document is not well formated*, so I don't want to read it. Maybe there are clues inside.
Anyway, I don't really like this kind of studies. In my opinion, it is like saying : "Oh, there is a 'social' aspect in life!". That's always the case even though it is not always easy to demonstrate it.
* : no figures, useless double line spacing, no table of contents for 52 pages