Systematic review of the Hawthorne effect: New concepts are needed to study research participation effectsJim McCambridge, Diana R Elbourne, John Witton|Journal of Clinical Epidemiology|2013Cited by 2.7k
The Effects of Demand Characteristics on Research Participant Behaviours in Non-Laboratory Settings: A Systematic ReviewJim McCambridge, John Witton, Marijn de Bruin|PLoS ONE|2012Cited by 270
Can Research Assessments Themselves Cause Bias in Behaviour Change Trials? A Systematic Review of Evidence from Solomon 4-Group StudiesJim McCambridge, Diana Elbourne, John Witton et al.|PLoS ONE|2011Cited by 101
Cannabis use and the GP: brief motivational intervention increases clinical enquiry by GPs in a pilot study.Jim McCambridge, John Witton, John Strang et al.|PubMed|2003Cited by 19