Bah humbug! Association between sending Christmas cards to trial participants and trial retention: randomised study within a trial conducted simultaneously across eight host trials.

Elizabeth ColemanCatherine ArundelLaura ClarkLaura DohertyKatie GilliesCatherine HewittKaren InnesAdwoa ParkerDavid TorgersonShaun Treweek

Published in: BMJ (Clinical research ed.) (2021)

SWAT repository https://www.qub.ac.uk/sites/TheNorthernIrelandNetworkforTrialsMethodologyResearch/FileStore/Filetoupload,846275,en.pdf#search=SWAT%2082.

Keyphrases

study protocol
clinical trial
phase iii
phase ii
open label
randomized controlled trial
placebo controlled