. 2012 Mar 20;12:69. doi: 10.1186/1472-6963-12-69
Copyright ©2012 Manniën 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 1.
Data flow of the questionnaires and diaries.