| AOA | American Osteopathic Association; Administration on Aging; Alpha Omega Alpha Honor Society; American... |
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| AOSSM | American Orthopedic Society for Sports Medicine |
| ARRS | American Roentgen Ray Society |
| ARSC | arylsulfatase C; Associate of the Royal Society of Chemistry |
| ARSPH | Associate of the Royal Society for the Promotion of Health |