Correction to: Mobility related physical and functional losses due to aging and disease - a motivation for lower limb exoskeletons

The original article contains an error in Fig. 3f whereby data is erroneously extrapolated beyond 80 years of age; this also affects statements made elsewhere in the article. Thus, the correct version of Fig. 3f can be viewed ahead and should be considered in place of the original Fig. 3f; furthermore, the following amendments to affected statements should also be considered