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One study started before the host trial (Chaffin 2009).
For four host trials, the strategy was applied during the pilot phase, and, for one other host trial, the retention strategy was applied before the host trial started.
Two studies investigated the use of qualitative methods embedded in a host trial.
Interviewees expressed concerns about study management burden, given that managing the host trial was already challenging.
9 Data extracted for each host trial were: aim, comparators, primary outcome, disease area and setting.
39 Two trials followed up participants in smoking cessation trials after the host trial finished.
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From January, driverless cars will be allowed to test on public roads, he announced; cities will be invited to bid for the chance to host trials, and the rules of the road will be reviewed to ensure they are fit for the hoped-for revolution.
The retention trials were embedded in real trials (host trials) and not hypothetical trials.
Retention trials were embedded in host trials that recruited participants from different settings.
The other host trials included multiple retention trials (one unpublished for the retention trials by Bailey 1 and Bailey 2).
For three host trials, the retention strategy was applied in further follow-up of trial participants after completion.
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