van Bunnik, Bram AD ; Morgan, Alex LK ; Bessell, Paul R... https://researchonline.lshtm.ac.uk/id/eprint/4662139/1/Segmentation%20and%20shielding%20of%20the%20most%20vulnerable%20members%20of%20the%20population%20as%20elements%20of%20an%20exit%20strategy%20from%20COVID-19%20lo.pdf.
,
2021