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Contributors HFL wrote the first draft. Both authors contributed to conceptual analysis, substantive editing, and final approval of the manuscript.
Funding This authors receive funding from the Greenwall Foundation as Faculty Scholars (no award number).
Competing interests Both authors received an honorarium from 1Day Sooner for producing an independent report on the ethics of payment for participation in human infection challenge studies: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3674548.
Patient consent for publication Not required.
Provenance and peer review Commissioned; internally peer reviewed.
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