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Since medical development makes the global elderly population aging.
(United Nations Population Fund noted that one of the most important trends
in the 21st century is the aging population .
Its impact will be important and relevant to all levels involved in our society .)
Elderly most commonly encountered problem is simply dropped ability to act , because the body is degraded , so there may be more and more people use this type of tool aids ,
such as crutches, wheelchairs .....
Chung Hua University
Hsinchu City 300, Taiwan