Aryal, K., Mowbray, F. I., Miroshnychenko, A., Strum, R. P., Dash, D., Hillmer, M. P., Malikov, K., Costa, A. P., Jones, A. 2024. Evaluating methods for risk prediction of Covid-19 mortality in nursing home residents before and after vaccine availability: a retrospective cohort study. BMC Med Res Methodol. 24 (1) 77.