| NSF | National Science Foundation; nodular subepidermal fibrosis |
|---|---|
| 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 |