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. Author manuscript; available in PMC: 2015 Dec 22.
Published in final edited form as: Handb Clin Neurol. 2013;110:283–294. doi: 10.1016/B978-0-444-52901-5.00023-X

Fig. 23.1.

Fig. 23.1

Percentage of population above 65 years of age (UN 2008 Data Series). (Courtesy of IEEE Robotics and Automation Magazine and Professor Henrik Christensen: IEEE, 2010.)