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. 2020 Jun 12;20(8):e192–e197. doi: 10.1016/S1473-3099(20)30483-7

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WHO clinical progression scale

ECMO=extracorporeal membrane oxygenation. FiO₂=fraction of inspired oxygen. NIV=non-invasive ventilation. pO₂=partial pressure of oxygen. SpO₂=oxygen saturation. *If hospitalised for isolation only, record status as for ambulatory patient.