| AAEE | adverse effect |
| BMI | body mass index |
| CG | control group |
| ECMO | extracorporeal membrane oxygenation |
| HP | hyperimmune plasma |
| MOH | Mateu Orfila Hospital |
| PG | plasma group |
| RHM | Regional Hospital of Manacor |
| SEM | standard error of the mean |
| SOFA | Sequential Organ Failure Assessment score |
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