. 2011 Mar 3;8:17. doi: 10.4314/pamj.v8i1.71070
© Mostafa Abdel-Monhem Amr et al.
The Pan African Medical Journal - ISSN 1937-8688. This is an Open Access article distributed under the terms of the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1:
Sampling scheme used for the selection of participants