Clinical status on 7-point ordinal scale: 1. Not hospitalised, no limitations on activities 2. Not hospitalised, limitation on activities, 3. Hospitalised, not requiring supplemental oxygen, 4. Hospitalised, requiring supplemental oxygen, 5. Hospitalised, on non-invasive ventilation or high flow oxygen devices, 6. Hospitalised, on invasive mechanical ventilation or ECMO (Extracorporeal membrane oxygenation) 7. Death.

Clinical status on 7-point ordinal scale: 1. Not hospitalised, no limitations on activities 2. Not hospitalised, limitation on activities, 3. Hospitalised, not requiring supplemental oxygen, 4. Hospitalised, requiring supplemental oxygen, 5. Hospitalised, on non-invasive ventilation or high flow oxygen devices, 6. Hospitalised, on invasive mechanical ventilation or ECMO (Extracorporeal membrane oxygenation) 7. Death.