| AO | abdominal aorta; achievement orientation; acid output; acridine orange; ankle orthosis; anodal openi... |
|---|---|
| STANDOUT | soft thresholding and depth cueing of unspecified techniques |
| URD | unspecified respiratory disease; upper respiratory disease |
| AVO | aortic valve opening; aortic valve orifice; atrioventricular opening |
| FSI | foam stability index; Food Sanitation Institute; functional status index; function status index |