It involves putting a needle, a fairly large needle into usually one of the pelvic bones and collecting marrow from which is tissue that's deep inside those bones.
Up until earlier this year Mr Bull was assessed and diagnosed by biopsy, using a largeneedle pushed through the ribs, which would often have to be repeated for accuracy.
Nothing that happens in South Africa any time soon is going to be large enough to move the needle as far as Wal-Mart stock is concerned, but it is positive to see the company embarking on the next phase of their overseas expansion now that Brazil, China and other markets have proven successful.
