Diffusion of Treatment Effect
If there are opportunities for pts in different groups to interact with one another during the study such as receiving treatment in the same clinic then pts in the control group may be exposed to 1 or more types of treatment that can change their outcomes.
Citation
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Yomogida N, Kerstein C. Diffusion of Treatment
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Archive/Evidene Based Practice/Article Appraisal/Validity/Threats to
internal validity/diffusion_of_treatment_effect.html