title: Unavailability of online supplementary scientific information from articles published in major journals.
abstract: 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.
authors.affiliation: Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina 45110, Greece. me01760@cc.uoi.gr
authors.forename: Evangelos
authors.initials: E
authors.lastname: Evangelou
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Trikalinos
authors.forename: John P A
authors.initials: JP
authors.lastname: Ioannidis
mesh_terms: D022126:Access to Information; D016206:Databases, Bibliographic; D016208:Databases, Factual; D007255:Information Services / Q000639:trends*; D020407:Internet; D018156:Journalism, Medical; D007993:Libraries, Medical; D009862:Online Systems; D010506:Periodicals as Topic; D011643:Publishing / Q000639:trends*; D012106:Research / Q000639:trends