Is there actual evidence for this? You noted that one 2006 study. But was that all? I know there is a trend here, but, I have a hard time believing this is conclusive. And even if it is "most" that leaves a broad spectrum available, doesn't it?

Possessor of Paul Newman eyes. Author of many things straightforward and strange. Some of them appear here. “Women zai shuo ba” as the Mandarin say. Born 2016.