Can Research Assessments Themselves Cause Bias in Behaviour Change Trials? A Systematic Review of Evidence from Solomon 4-Group Studies

• Jim McCambridge ,

  * E-mail: Jim.McCambridge@lshtm.ac.uk

  Affiliation Centre for Research on Drugs & Health Behaviour, Faculty of Public Health & Policy, London School of Hygiene & Tropical Medicine, London, United Kingdom

  ⨯
• Kaanan Butor-Bhavsar,

  Affiliation Centre for Research on Drugs & Health Behaviour, Faculty of Public Health & Policy, London School of Hygiene & Tropical Medicine, London, United Kingdom

  ⨯
• John Witton,

  Affiliation National Addiction Centre, Institute of Psychiatry, King's College London, London, United Kingdom

  ⨯
• Diana Elbourne

  Affiliation Department of Medical Statistics, Faculty of Epidemiology & Population Health, London School of Hygiene & Tropical Medicine, London, United Kingdom

  ⨯