1. Salman, RA-S, Beller, E, Kagan, J, et al. Increasing value and reducing waste in biomedical research regulation and management. Lancet 2014; 383: 176–185.
Google Scholar | Crossref | Medline2. Daykin, A, Clement, C, Gamble, C, et al. ‘Recruitment, recruitment, recruitment’– the need for more focus on retention: a qualitative study of five trials. Trials 2018; 19: 76.
Google Scholar | Crossref | Medline3. Altman, DG. Missing outcomes in randomized trials: addressing the dilemma. Open Med 2009; 3: e51–e53.
Google Scholar | Medline4. Akl, EA, Briel, M, You, JJ, et al. Potential impact on estimated treatment effects of information lost to follow-up in randomised controlled trials (LOST-IT): systematic review. BMJ 2012; 344: e2809.
Google Scholar | Crossref | Medline5. Bell, ML, Fiero, M, Horton, NJ, et al. Handling missing data in RCTs; a review of the top medical journals. BMC Med Res Methodol 2014; 14: 118.
Google Scholar | Crossref | Medline | ISI6. Wood, AM, White, IR, Thompson, SG. Are missing outcome data adequately handled? A review of published randomized controlled trials in major medical journals. Clin Trials 2004; 1(4): 368–376.
Google Scholar | SAGE Journals7. Walters, SJ, Bonacho dos Anjos, Henriques-Cadby I, Bortolami, O, et al. Recruitment and retention of participants in randomised controlled trials: a review of trials funded and published by the United Kingdom Health Technology Assessment Programme. BMJ Open 2017; 7: e015276.
Google Scholar | Crossref | Medline8. Robinson, KA, Dinglas, VD, Sukrithan, V, et al. Updated systematic review identifies substantial number of retention strategies: using more strategies retains more study participants. J Clin Epidemiol 2015; 68(12): 1481–1487.
Google Scholar | Crossref | Medline9. Karlson, CW, Rapoff, MA. Attrition in randomized controlled trials for pediatric chronic conditions. J Pediatr Psychol 2008; 34: 782–793.
Google Scholar | Crossref | Medline | ISI10. Akl, EA, Kahale, LA, Ebrahim, S, et al. Three challenges described for identifying participants with missing data in trials reports, and potential solutions suggested to systematic reviewers. J Clin Epidemiol 2016; 76: 147–154.
Google Scholar | Crossref | Medline11. Kahale, LA, Diab, B, Khamis, AM, et al. Potentially missing data are considerably more frequent than definitely missing data: a methodological survey of 638 randomized controlled trials. J Clin Epidemiol 2019; 106: 18–31.
Google Scholar | Crossref | Medline12. Hussain, JA, Bland, M, Langan, D, et al. Quality of missing data reporting and handling in palliative care trials demonstrates that further development of the CONSORT statement is required: a systematic review. J Clin Epidemiol 2017; 88: 81–91.
Google Scholar | Crossref | Medline13. Toerien, M, Brookes, ST, Metcalfe, C, et al. A review of reporting of participant recruitment and retention in RCTs in six major journals. Trials 2009; 10: 52.
Google Scholar | Crossref | Medline | ISI14. Wartella, EA and National Research Council. Prevention and treatment of missing data in clinical trials. Washington, DC: National Academies Press, 2010.
Google Scholar15. Brueton, VC, Tierney, J, Stenning, S, et al. Strategies to improve retention in randomised trials. Cochrane Database Syst Rev 2013; 12: MR000032.
Google Scholar16. El Feky, A, Gillies, K, Gardner, H, et al. Non-randomised evaluations of strategies to increase participant retention in randomised controlled trials: a systematic review. Syst Rev 2020; 9: 224.
Google Scholar | Crossref | Medline17. Kearney, A, Daykin, A, Shaw, ARG, et al. Identifying research priorities for effective retention strategies in clinical trials. Trials 2017; 18: 406.
Google Scholar | Crossref | Medline18. Tudur Smith, C, Hickey, H, Clarke, M, et al. The trials methodological research agenda: results from a priority setting exercise. Trials 2014; 15: 32.
Google Scholar | Crossref | Medline | ISI19. Kearney, A, Harman, NL, Rosala-Hallas, A, et al. Development of an online resource for recruitment research in clinical trials to organise and map current literature. Clin Trials 2018; 15(6): 533–542.
Google Scholar | SAGE Journals | ISI20. Gkioni, E, Rius, R, Dodd, S, et al. A systematic review describes models for recruitment prediction at the design stage of a clinical trial. J Clin Epidemiol 2019; 115: 141–149.
Google Scholar | Crossref | Medline21. Rowlands, C, Rooshenas, L, Fairhurst, K, et al. Detailed systematic analysis of recruitment strategies in randomised controlled trials in patients with an unscheduled admission to hospital. BMJ Open 2018; 8: e018581.
Google Scholar | Crossref | Medline22. Houghton, C, Dowling, M, Meskell, P, et al. Factors that impact on recruitment to randomised trials in health care: a qualitative evidence synthesis. Cochrane Database Syst Rev 2020; 10: MR000045.
Google Scholar | Medline23. Parkinson, B, Meacock, R, Sutton, M, et al. Designing and using incentives to support recruitment and retention in clinical trials: a scoping review and a checklist for design. Trials 2019; 20: 624.
Google Scholar | Crossref | Medline24. El Feky, A, Gillies, K, Gardner, H, et al. A protocol for a systematic review of non-randomised evaluations of strategies to increase participant retention to randomised controlled trials. Syst Rev 2018; 7: 30.
Google Scholar | Crossref | Medline25. Bower, P, Brueton, V, Gamble, C, et al. Interventions to improve recruitment and retention in clinical trials: a survey and workshop to assess current practice and future priorities. Trials2014; 15: 9.
Google Scholar26. Palmer, MJ, Mercieca-Bebber, R, King, M, et al. A systematic review and development of a classification framework for factors associated with missing patient-reported outcome data. Clin Trials 2018; 15(1): 95–106.
Google Scholar | SAGE Journals | ISI27. Liu, Y, Pencheon, E, Hunter, RM, et al. Recruitment and retention strategies in mental health trials – a systematic review. PLoS ONE 2018; 13(8): e0203127.
Google Scholar | Crossref | Medline28. Coday, M, Boutin-Foster, C, Goldman Sher, T, et al. Strategies for retaining study participants in behavioral intervention trials: retention experiences of the NIH behavior change consortium. Mahwah, NJ: Lawrence Erlbaum Associates, Inc., 2005, p. 55.
Google Scholar29. Nakash, R, Hutton, J, Lamb, S, et al. Response and non-response to postal questionnaire follow-up in a clinical trial – a qualitative study of the patient’s perspective. J Eval Clin Pract 2008; 14(2): 226–235.
Google Scholar | Crossref | Medline30. Rombach, I, Rivero-Arias, O, Gray, AM, et al. The current practice of handling and reporting missing outcome data in eight widely used PROMs in RCT publications: a review of the current literature. Berlin: Springer Science + Business Media, 2016, p. 1613.
Google Scholar31. Mercieca-Bebber, R, Palmer, MJ, Brundage, M, et al. Design, implementation and reporting strategies to reduce the instance and impact of missing patient-reported outcome (PRO) data: a systematic review. BMJ Open 2016; 6: e010938.
Google Scholar | Crossref | Medline | ISI32. Waterhouse, DM, Harvey, RD, Hurley, P, et al. Early impact of COVID-19 on the conduct of oncology clinical trials and long-term opportunities for transformation: findings from an American Society of Clinical Oncology Survey. JCO Oncol Pract 2020; 16(7): 417–421.
Google Scholar | Crossref | Medline33. Simmonds, B, Turner, N, Thomas, L, et al. Patients’ experiences of participating in a large-scale trial of cognitive behavioural therapy for depression: a mixed methods study. Fam Pract 2013; 30(6): 705–711.
Google Scholar | Crossref | Medline34. Butler, J, Quinn, SC, Fryer, CS, et al. Characterizing researchers by strategies used for retaining minority participants: results of a national survey. Contemp Clin Trials 2013; 36(1): 61–67.
Google Scholar | Crossref | Medline35. Gul, RB, Ali, PA. Clinical trials: the challenge of recruitment and retention of participants. J Clin Nurs 2010; 19(1–2): 227–233.
Google Scholar | Crossref | Medline | ISI36. Kearney, A, Rosala-Hallas, A, Bacon, N, et al. Reducing attrition within clinical trials: the communication of retention and withdrawal within patient information leaflets. PLoS ONE 2018; 13(10): e0204886.
Google Scholar | Crossref | Medline37. Tunji-Ajayi, P, Duncan, EM, Gillies, K. An embedded mixed-methods study highlighted a lack of discussions on retention in clinical trial consultations. J Clin Epidemiol 2020; 123: 49–58.
Google Scholar | Crossref | Medline38. Brunsdon, D, Biesty, L, Brocklehurst, P, et al. What are the most important unanswered research questions in trial retention? A James Lind Alliance Priority Setting Partnership: the PRioRiTy II (Prioritising Retention in Randomised Trials) study. Trials 2019; 20: 593.
Google Scholar | Crossref | Medline39. Gillies, K, Kearney, A, Keenan, C, et al. Strategies to improve retention in randomised trials. Cochrane Database Syst Rev 2021; 3: MR000032.
Google Scholar | Medline40. Norman, CR, Gargon, E, Leeflang, MMG, et al. Evaluation of an automatic article selection method for timelier updates of the Comet Core Outcome Set database. Database 2019; 2019: baz109.
Google Scholar | Crossref | Medline41. Muhammad, I, Bollegala, D, Coenen, F, et al. Maintaining curated document databases using a learning to rank model: the ORRCA experience. In: Bramer, M, Ellis, R (eds) International conference on innovative techniques and applications of artificial intelligence. Cham: Springer, 2020, pp. 345–357.
Google Scholar42. Mongeon, P, Paul-Hus, A. The journal coverage of Web of Science and Scopus: a comparative analysis. Scientometrics 2016; 106: 213–228.
Google Scholar | Crossref | ISI