| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Research Society; orthopedic surgeon, orthopedic surgery; oxygen radical scavengers |
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| ORSA | osteoclast resorption stimulating activity |
| WHO ORS | World Health Organization Oral Rehydration Solution osmolality 330; 세계보건기구 경구 수액 용액 |
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