| NCFA | Narcolepsy and Catalepsy Foundation of America |
|---|---|
| NIA | National Institute on Aging; nephelometric inhibition assay; niacin; no information available; Nutri... |
| OAA | Old Age Assistance; Older Americans Act; Opticians Association of America; oxaloacetic acid |
| PCA | para-chloramphetamine; parietal cell antibody; passive cutaneous anaphylaxis; patient care assistant... |
| PIA | photoelectric intravenous angiography; plasma insulin activity; preinfarction angina; Psychiatric In... |