| OAA | Old Age Assistance; Older Americans Act; Opticians Association of America; oxaloacetic acid |
|---|---|
| OSA | obstructive sleep apnea; Office of Services to the Aging; Optical Society of America; ovarian sectio... |
| PCA | para-chloramphetamine; parietal cell antibody; passive cutaneous anaphylaxis; patient care assistant... |
| PIA | photoelectric intravenous angiography; plasma insulin activity; preinfarction angina; Psychiatric In... |
| PPFA | Planned Parenthood Federation of America |
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