| 1,25(OH)2D | 1,25-dihydroxyvitamin D |
| 25(OH)D | 25-hydroxyvitamin D |
| ARDS | Acute respiratory distress syndrome |
| BMI | Body mass index |
| CRP | C-reactive protein |
| COVID-19 | Coronavirus disease 2019 |
| ECMO | Extracorporeal membrane oxygenation |
| ICU | Intensive care unit |
| IL-6 | Interleukin-6 |
| IMV | Invasive mechanical ventilation |
| LOS | Length of stay |
| PTH | Parathyroid hormone |
| SAPS | Simplified Acute Physiology Score III |
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