. 2012 Dec 26;2012:647896. doi: 10.1155/2012/647896
Copyright © 2012 F. W. Stahnisch and M. Verhoef.
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.
Abraham Flexner (1866–1959).