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WTAP as a function of risk. Respondents indicated their WTAP (y-axis) on a slider scale from 0: strongly disagree to 6: strongly agree in response to the statement ‘(the potential participant) should be allowed to participate in the study’. This was indicated for each hypothetical study involving each risk category (x-axis). Mean values are labelled. CHIM, Controlled Human Infection Model; WTAP, willingness to allow participation.
