https://www.nicd.ac.za/early-assessment-of-the-clinical-severity-of-the-sars-cov-2-omicron-variant-in-south-africa/
https://www.medrxiv.org/content/10.1101/2021.12.21.21268116v1
https://www.medrxiv.org/content/10.1101/2021.12.21.21268116v1.full.pdf
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