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Unavailability of online supplementary scientific information from articles published in major journals

Evangelos Evangelou^*,1, Thomas A. Trikalinos^*, and John P.A. Ioannidis^*,,

^* Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina, Greece;
Institute for Clinical Research and Health Policy Studies, Tufts-New England Medical Center, Boston, Massachusetts, USA; and
Biomedical Research Institute, Foundation for Research and Technology-Hellas, Ioannina, Greece

¹Correspondence: Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina 45110, Greece. E-mail: me01760{at}cc.uoi.gr

Printed articles increasingly rely on online supplements to store critical scientific information, but such data may eventually become unavailable. We checked the current availability of online supplementary scientific information published in six top-cited scientific journals (Science, Nature, Cell, New England Journal of Medicine, Lancet, Proceedings of the National Academy of Sciences USA). Here we show that in 4.7% and 9.6% of articles with online supplementary material, some of the supplements became unavailable within 2 and 5 years of their publication, respectively.—Evangelou, E., Trikalinos, T. A., Ioannidis, J. P. A. Unavailability of online supplementary scientific information from articles published in major journals.

Key Words: supplementary information • broken links • internet • scientific journals

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