. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: Clin Biomech (Bristol). 2015 Jan 31;30(3):248–253. doi: 10.1016/j.clinbiomech.2015.01.007
© 2015 Published by Elsevier Ltd. This manuscript version is made available under the CC BY-NC-ND 4.0 license.