Well I have quoted the paper so why you choose to say that I have said something the paper hasn't can only be for the sake of being argumentative.
I have mentioned before the issues re large Gallstones traversing the CBD. That answers your questions. These large Gallstones are not seen in the CBD, and the small Gallstones get stuck so any larger ones would but we don't see them. I guess you'll claim that I'm lying which seems to be the standard response on this board.
Why do you claim that when you don't know me? Because otherwise your view of the world is wrong.