. 2016 Sep 14;6(4):303–313. doi: 10.1016/j.jegh.2016.08.002
© 2016 Published by Elsevier Ltd. on behalf of Ministry of Health, Saudi Arabia.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).