| ADMA | 8-isoprostaglandin F2α dimethy larginine |
| CT | computed tomography |
| DRS-R-98 | Delirium Rating Scale—Revised-98 |
| Hb | hemoglobin |
| Hcy | homocysteine |
| HHcy | hyperhomocysteinemia |
| MICD | metformin induced cobalamin deficiency |
| MADRS | Montgomery Asberg Depression rating scale |
| MCV | mean corpuscular volume |
| MMA | methylmalonic acid |
| MR | magnetic resonance |
| MMSE | Mini-Mental State Examination |
| MTHFR | 5,10-methylenetetrahydrofolate reductase gene |
| PPI | proton-pump inhibitor |
| RDAs | recommended dietary allowances |
| RBCs | red blood cells |
| SCD | sub-acute combined degeneration |
| SDMA | arginine and symmetric dimethyl arginine |
| TPHA | Treponema pallidum hematoglutinin assay |
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