Bah humbug! Association between sending Christmas cards to trial participants and trial retention: randomised study within a trial conducted simultaneously across eight host trials. (2021)

Abstract

No abstract provided

Bibliographic Information

Digital Object Identifier: http://dx.doi.org/10.1136/bmj-2021-067742

PubMed Identifier: 34906985

Publication URI: http://europepmc.org/abstract/MED/34906985

Type: Journal Article/Review

Volume: 375

Parent Publication: BMJ (Clinical research ed.)

ISSN: 0959-8138