| CAO | chronic airway obstruction; coronary artery obstruction |
|---|---|
| SAO | small airway obstruction; splanchnic artery occlusion; subvalvular aortic obstruction |
| STANDOUT | soft thresholding and depth cueing of unspecified techniques |
| URD | unspecified respiratory disease; upper respiratory disease |
| CIIP | chronic idiopathic intestinal pseudo-obstruction |