. 2014 Oct 29;22(5):347–349. doi: 10.5455/aim.2014.22.347-349
Copyright: © AVICENA
This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Various substitutions given by diff erent authors