After much digging, they come to the conclusion that it does not exist in any peer-reviewed paper, but cropped up in a Rocky Mountain newspaper and has been quoted as fact ever since.
It concludes in its recommendations:
"We recommend that researchers and organizations stop using the 23 times more toxic factoid because there appears to be no evidence for it in the scientific literature."This was written over a year ago, but the BMA - the sawbones syndicate - hasn't caught up yet.
Doctors - go wash your hands.