| COR | cardiac output recorder; comprehensive outpatient rehabilitation; conditioned orientation reflex; co... |
|---|---|
| OR | a logical binary relation that is true if any argument is true, and false otherwise; [o]estrogen rec... |
| POR | patient-oriented research; physician of record; postocclusive oscillatory response; prevalence odds ... |
| RO | radiation oncology; radiation output; ratio of; relative odds; renal osteodystrophy; reverse osmosis... |
| sOR | stratified odds ratio |