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. 2020 Apr 3;21:304. doi: 10.1186/s13063-020-04234-0

Table 7.

Number of digital retention tools CTUs mentioned that had impressed them, broken down by category

Retention tools n (%)
SMS / email reminders 10 (67)
Study websites 0 (0)
Apps and web-based data collection 0 (0)
Social media 1 (7)
Other – in-house 4 (18)

CTU Clinical Trials Unit