The most famous recent study used Iceland [0], which is about as homogeneous as you can imagine. [0] http://www.pnas.org/content/114/5/E727.full http://www.pna

The most famous recent study used Iceland [0], which is about as homogeneous as you can imagine. [0] http://www.pnas.org/content/114/5/E727.full http://www.pnas.org/content/114/5/E727.full