Table 1 Additional RCTs identified through contact with CTUs and trial methodologists for a systematic review of strategies to improve retention in RCTs
Eligible RCT | Publication status at the time of the survey | Journal | Duplicate sources |
|---|---|---|---|
Survey of UK CTUs | |||
Cockayne (2005) [9] | Published | BMC Medical Research Methodology | Reference list of relevant literature [19] |
Brown (1997) [8] | Published | Journal of Epidemiology and Community Health | Reference list of relevant literature and included RCTs [19, 20] |
Marson (2007) [12] | Grey literature | Health Technology Assessment (HTA) report Appendix | – |
Nakash 2007 [11] | Grey literature | PhD thesis chapter | – |
Ashby 2011 [10] | In press | Journal of Clinical Epidemiology | Medline search update (May 2012) |
MacLennan [13] | Unpublished | Subsequently published in BMC Trials 2014 | – |
Mitchell | Unpublished on-going study | – | – |
Personal communication | |||
Gates (2009) [14] | Published | Trials | Medline search updates (May 2012) Cochrane Methodology register |
Khadajesari (2011) (a) [15] | Unpublished at the time of the survey | Subsequently published in Journal of Medical Internet Research | Medline search updates (May 2012) |
Khadajesari (2011) (b) [15] | Unpublished at the time of the survey | Subsequently published in Journal of Medical Internet Research | Medline search updates (May 2012) |
Severi (2011) (a) [16] | Unpublished at the time of the survey | Subsequently published in Clinical Trials | Medline search updates (May 2012) Survey of UK CTUs |
Severi (b) (2011) [16] | Unpublished at the time of the survey | Subsequently published in Clinical Trials | Medline search updates (May 2012) Survey of UK CTUs |
Bailey 1 | Unpublished | – | – |
Bailey 2 | Unpublished | ||