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In which phase of clinical trials healthy volunteers are enrolled? 

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We develop the method in the context of phase II oncology trials, but the method applies readily to other clinical areas in which multiple responses per patient are of interest.
Fifteen patients enrolled onto this phase I trial.
Among 9,901 patients, 5.3% enrolled onto trials.
There are a variety of physician and patient characteristics which have previously been shown to influence participation in randomised clinical trials.
Patients participating in Phase I trials need further education to improve their understanding of the true intent of early Phase trials.
These contributions significantly enhance the design of phase III trials, ultimately leading to the efficient utilization of clinical trial resources.
These methods are useful for designing stratified phase II clinical trials.

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