. 2011 May 16;12:98. doi: 10.1186/1471-2474-12-98
Copyright ©2011 Kjaer et al; licensee BioMed Central Ltd.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 6.
Mid back pain tracking. For explanation, see Figure 3.