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Payment in challenge studies: ethics, attitudes and a new payment for risk model

 

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Nov 2020500495123
Dec 202034930179
Jan 202120017168
Feb 202125624161
Mar 202124120969
Apr 202119016657
May 202120718748
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Jul 202113912346
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Apr 2023665425
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Nov 202313712918
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Total812675041904