Drake, T. M., Riad, A. M., Fairfield, C. J., Egan, C., Knight, S. R., Pius, R., Hardwick, H. E., Norman, L., Shaw, C. A., McLean, K. A., Thompson, A. A. R., Ho, A., Swann, O. V., Sullivan, M., Soares, F., Holden, K. A., Merson, L., Plotkin, D., Sigfrid, L., de Silva, T. I., … ISARIC4C investigators, O. B. O. T. (2021). Characterisation of in-hospital complications associated with COVID-19 using the ISARIC WHO Clinical Characterisation Protocol UK: a prospective, multicentre cohort study. Lancet, 398(10296), 223-237. https://doi.org/10.1016/S0140-6736%2821%2900799-6