That's like saying that there's undocumented crime on the moon. You don't know that. But you have a theory that you most likely need more funding to look into. ;) On the other hand, if you have documentation to the contrary, I'll of course retract my own claim.
Now you're getting all touchy feely instead of looking at the data.
Which is why this paper and most of the comments in this thread reek of falsities and unfounded bias. Which is the norm here now.