. 2015 Nov 2;8:10.3402/gha.v8.28454. doi: 10.3402/gha.v8.28454
© 2015 Leandri Pretorius et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License, allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material for any purpose, even commercially, provided the original work is properly cited and states its license.
Fig. 3.
Flowchart of the process of study selection.