Wainstein, M., MacDonald, S., Fryer, D., Young, K., Balan, V., Begum, H., Burrell, A., Citarella, B., Cobb, J., Kelly, S., Kennon, K., Lee, J., Merson, L., Murthy, S., Nichol, A., Semple, M., Strudwick, S., Webb, S., Rossignol, P., Claure-Del Granado, R., Shrapnel, S. & ISARIC Clinical Characterization Group 2022, 'Use of an extended KDIGO definition to diagnose acute kidney injury in patients with COVID-19: A multinational study using the ISARIC–WHO clinical characterisation protocol', PLoS Medicine, 19(4), article no: e1003969. https://doi.org/10.1371/journal.pmed.1003969