| NMF | N-methylformamide; National Medical Fellowship; National Migraine Foundation; nonmigrating fraction |
|---|---|
| OEF | oil immersion field; oxygen extraction fraction |
| PPF | pellagra preventive factor; phagocytosis promoting factor; phosphonoformate; plasma protein fraction... |
| REF | ejection fraction at rest; referred; refused; renal erythropoietic factor |
| REFI | regional ejection fraction image |