Well at least not the kind of arrogance which means I refuse to look at actual literature! No, unfortunately logistics is the issue at the moment. In any case no apologies necessary.
Pity, if I was back at home base I would like to delve into the issue more, but since I can’t do the subject justice right now its best to let it go, although I continue to feel that ‘african american’ likely to be a poor proxy for a finer resolution – but then there is the issue of data.