. 2012 Dec 17;2012:185429. doi: 10.1155/2012/185429
Copyright © 2012 Rutger J. Franken et al.
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.
Intra-abdominal free air on an erect chest X-ray.