| AAO-HNS | American Academy of Otolaryngology Head and Neck Surgery |
|---|---|
| ACOG | American College of Obstetricians and Gynecologists |
| ASTM | American Society for Testing and Materials |
| ASTRO | American Society for Therapeutic Radiology and Oncology |
| APUD | Amine Precursor Uptake and Decarboxylation |