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Table 5 Sources of conference abstracts and unpublished study information on 28 RCTs: databases, trial registers, and systematic reviews

From: Negative pressure wound therapy: Potential publication bias caused by lack of access to unpublished study results data

No Abstracts or other sources Bibliographic databases Trial registers Systematic reviews
   MEDLINE, EMBASE or CINAHL Cochrane Clinical Trials CT.gov NRR Evans 2001 [83] Samson 2004 [9] Pham 2006 [68] Fisher 2003 [84]; Higgins 2003 [85]; Costa 2005 [67]; OHTAC 2006 [10]
1 Vuerstaek [74] - + - - - + - -
2 No abstract* - - - - - - - -
3 Obdeijn [75] - + - - - + - -
4 Payne [76] - + - - - + - -
5 Moues [77] - + - - - + - -
6 Heath [78] - + - - + - + -
7 No abstract - - - - - - - -
8 No abstract - - - - - - - -
9 Joseph [79] - + - - - - - -
10 Adams [26] - - - + - - + -
11 Fryer [27] - - + - - - + -
12 McCarthy [28] - - - + - - + -
13 Walker [29] - - - + - - + -
14 No abstract§ - - - - - - - -
15 No abstract|| - - - - - + - -
16 Bayer [31] - + - - - + - -
17 Greer [33] - + - - + - + -
18 Orgill [34] - + - - - + - -
19 Stannard [35] - + - - - + - -
20 Armstrong [36] - + - - - + - -
21 McCarthy [37] - - + - - - - -
22 Molnar [38] - + - - - + - -
23 Niezgoda [39] - + - - - + - -
24 Stannard [40] - + - - - + - -
25 Stannard [41] - + - - - + - -
26 Foo [42] - + - - - + - -
27 Gupta [43] - + - - - - - -
28 Lantis [44] - + - - - + - -
   0 18 2 3 2 15 6 0
  1. * No preceding abstract was identified concerning the full-text article by Llanos 2006 (Tables 7–9).
  2. † No preceding abstract was identified, but information by the manufacturer KCI was provided concerning the full-text article by Eginton 2003 (Tables 7–9).
  3. ‡ No preceding abstract was identified, but information by the manufacturer KCI was provided concerning the full-text article by Wanner 2003 (Tables 7–9).
  4. §No preceding abstract was identified, but information by the manufacturer KCI was provided concerning the full-text article by Ford 2002 (Tables 7–9).
  5. || No preceding abstract was identified, but information by the manufacturer KCI was provided concerning this discontinued study KCI ID VAC 2001–02.
  6. CT.gov: ClinicalTrials.gov (United States); NRR: National Research Register (United Kingdom National Health System); RCT: randomised controlled trial