10.1371/journal.pone.0157263.g002 Benjamin M. Davies Benjamin M. Davies Maire McHugh Maire McHugh Ali Elgheriani Ali Elgheriani Angelos G. Kolias Angelos G. Kolias Lindsay A. Tetreault Lindsay A. Tetreault Peter J. A. Hutchinson Peter J. A. Hutchinson Michael G. Fehlings Michael G. Fehlings Mark R. N. Kotter Mark R. N. Kotter Trends in published research. Public Library of Science 2016 DCM PROSPERO MEDLINE CRD healthcare research Reported Outcome Measures EMBASE databases future research synthesis PRISMA guidelines Degenerative Cervical Myelopathy Reported outcome themes Results 108 studies trial outcomes limits Systematic Review Objective Degenerative Full text articles 2016-08-02 17:31:32 Figure https://plos.figshare.com/articles/figure/Trends_in_published_research_/3510571 <p>Stacked line graph of year of publication of identified studies. Retrospective studies are in blue, prospective studies in red and the number of RCTs indicated by the black line. [Pro: Prospective, Retro: Retrospective, RCT: Randomised Controlled Trial]. The number of publications has increased over time, including those deemed of higher quality (prospective and randomised).</p>