Data collection
We identified all COVID-19 cases from our laboratory data-base which has been followed up on a daily basis. Medical records were reviewed and patients’ demographic, medical and social history was collected. Laboratory and radiological information were available in the electronic records. We used a standardised data collection sheet which was used by all the authors. To assess frailty, we used the clinical frailty score (CFS) which classify patients in a range of very fit (score 1) to terminally ill (score 9). 7