. 2012 Jun 17;2012:208039. doi: 10.1155/2012/208039
Copyright © 2012 H. Schmidhammer and M. Spetea.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Examples of clinically used opioid analgesics.