Ссылки:[1] — https://www.bmj.com/content/375/bmj-2021-067742[2] -…

Ссылки:

[1] - https://www.bmj.com/content/375/bmj-2021-067742
[2] - https://www.facebook.com/irina.yakutenko/posts/10159538635184800
[3] - https://www.bmj.com/content/375/bmj-2021-067726

The BMJ
Bah humbug! Association between sending Christmas cards to trial participants and trial retention: randomised study within a trial…

Objectives To determine the effectiveness of sending Christmas cards to participants in randomised controlled trials to increase retention rate at follow-ups, and to explore the feasibility of doing a study within a trial (SWAT) across multiple host trials…