In terms of longer-term quality of life the use of MCP did not appear to affect outcome. However, this does not mean that MCP is of no therapeutic value to patients with COPD in specific circumstances. Although the cost-effectiveness analysis suggested that its use was cost-effective, much uncertainty was associated with this finding and it would be difficult to justify providing MCP therapy on the basis of cost-effectiveness alone. Future research should include evaluation of MCP for patients with COPD producing high volumes of sputum, and an evaluation of the effectiveness of ACBT in COPD exacerbation.
The number of vertebrae that make up the spine varies by species, ranging from forty to ninety-three. The cervical spine , found in all mammals, consists of seven vertebrae which, however, are reduced or fused. This gives stability during swimming at the expense of mobility. The fins are carried by the thoracic vertebrae , ranging from nine to seventeen individual vertebrae. The sternum is cartilaginous. The last two to three pairs of ribs are not connected and hang freely in the body wall. The stable lumbar and tail include the other vertebrae. Below the caudal vertebrae is the chevron bone ; the vortex developed provides additional attachment points for the tail musculature. 
Robert L. Forward, “Antiproton Annihilation Propulsion”, University of Dayton, 1985.