Impact of covert duplicate publication on meta-analysis: a case study.

@article{Tramr1997ImpactOC,
  title={Impact of covert duplicate publication on meta-analysis: a case study.},
  author={Martin R. Tram{\`e}r and Dr. John J. Reynolds and R Andrew Moore and H. J. McQuay},
  journal={BMJ},
  year={1997},
  volume={315 7109},
  pages={635-40}
}
OBJECTIVE To quantify the impact of duplicate data on estimates of efficacy. DESIGN Systematic search for published full reports of randomised controlled trials investigating ondansetron's effect on postoperative emesis. Abstracts were not considered. DATA SOURCES Eighty four trials (11,980 patients receiving ondansetron) published between 1991 and… CONTINUE READING