A value that bypasses some of the computations for an arithmetic operation can be supplied for performance of a dependent arithmetic operation without waiting for completion of the computations of the arithmetic operation. The use of autologous bone marrow or umbilical cord blood has been proposed as a good source of stem cells for cell therapy. These measurements are compared to calibration information obtained from calibration measurements. The proximal first expandable member and distal second expandable member are independently expandable of one another.