. 2013 Oct 31;2013:783190. doi: 10.1155/2013/783190
Copyright © 2013 C. M. Crawford and O. Igboeli.
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 4.
Photo courtesy of Gary Holland, M.D.