| WHO | World Health Organization |
| ECMO | Extracorporeal membranous oxygenation |
| COVID-19 | Coronavirus induced disease 2019 |
| SARS-CoV-2 | Severe acute respiratory syndrome coronavirus 2 |
| ICU | Intensive care unit |
| JSICM | The Japanese Society of Intensive Care Medicine |
| CRISIS | CRoss Icu Searchable Information System |
| IQR | Interquartile range |
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