follow-up for Xania
You're quite correct, they used a specific extract in this and other recent studies. But, I think it's reasonable to assume that many of the health-benefits attributed to this extract can also be expected for other forms of concentrated cocoa (like 100% pure cocoa powder).
Part of the reason they used a specific extract was to promote a more scientific approach to the studies. By using a standardized product, they remove some of the variables that naturally occur when testing (non-standardized) natural products.
BTW, one reason why I won't use the MARS extract is because it's not organic. I prefer the natural variations found in organic cocoa ... and without all the goodies that come with non-organic sources.
In the future, I think we'll see some natural food manufacturers produce organic versions of the MARS original. It's even possible that MARS may decide to manufacture such a product - if there's enough demand.