| AAO | American Academy of Osteopathy; American Academy of Ophthalmology; American Academy of Optometry; Am... |
|---|---|
| ABO | abortion; absent bed occupancy; American Board of Orthodontists; blood group system consisting of gr... |
| IAO | immediately after onset; intermittent aortic occlusion; International Association of Orthodontists |
| NESO | Northeastern Society of Orthodontists |