1. National Amputee Statistical Database (NASDAB),2005
2. Lower limb amputee survival;Stewart;Prosthet Orthot Int,1992
3. 10 years survival of finish lower limb amputees;Pohjolainen;Prosthet Orthot Int,1998
4. Office of Population Censuses and Surveys,1980
5. Energy cost of ambulation in health and disability. A literature review;Fisher;Arch Phys Med Rehabil,1978