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Table 1 Additional RCTs identified through contact with CTUs and trial methodologists for a systematic review of strategies to improve retention in RCTs

From: Identifying additional studies for a systematic review of retention strategies in randomised controlled trials: making contact with trials units and trial methodologists

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 MacLennan [13] Unpublished Subsequently published in BMC Trials 2014
 Mitchell Unpublished on-going study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 Khadajesari (2011) (a) [15] Unpublished at the time of the survey Subsequently published in Journal of Medical Internet Research Medline search updates (May 2012)
 Khadajesari (2011) (b) [15] Unpublished at the time of the survey Subsequently published in Journal of Medical Internet Research Medline search updates (May 2012)
 Severi (2011) (a) [16] Unpublished at the time of the survey Subsequently published in Clinical Trials Medline search updates (May 2012) Survey of UK CTUs
 Severi (b) (2011) [16] Unpublished at the time of the survey Subsequently published in Clinical Trials Medline search updates (May 2012) Survey of UK CTUs
 Bailey 1 Unpublished
 Bailey 2 Unpublished