I have been looking for this info for a couple of years. I was in the local paper, Houston Chronicle, and I misplaced it. But I remembered the theme of the article. My family is of European blood. Thank you for finding this and posting it. I think they have been doing a study of this for years.
I would tend to disagree. In the middle ages, populations were not mobile...People were born, lived and died, within a few miles...there was haredly any travel between villages. That's how the plague ended..it burned itself out...When everyone in a village was dead, it died off..