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Payment of COVID-19 challenge trials: underpayment is a bigger worry than overpayment

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  • JB-B and PU contributed equally.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests JB-B is an associate editor at JME.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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