| OIF | observed intrinsic frequency; oil immersion field; Osteogenesis Imperfecta Foundation |
|---|---|
| OREF | Orthopedic Research and Education Foundation |
| Parkinson's Disease Foundation; peritoneal dialysis fluid; Portable Document Format; pyruvate dehydr... | |
| RERF | Radiation Effects Research Foundation |
| RWJF | Robert Wood Johnson Foundation |
| NIS | National Immunization Survey |
|---|---|
| NIBSC | National Institute for Biological Standards and Control |
| NICE | National Institute for Clinical Excellence |
| NIOSH | National Institute for Occupational Safety and Health |
| NIA | National Institute of Aging |
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