New Zealand's Cultivated Blueberry industry was initially developed from varieties sourced from the USA.  Blueberries are relatively new in New Zealand compared to there.  Much of the research is undertaken in the US because of the relative size of the industries.  However we grow many of the same varieties here in New Zealand so you can relate the US research to the Blueberries we grow here.  Here is a link to some interesting information about the health enhancing properties of Blueberries.  Worlds Healthiest Foods