Summary of 88 articles that warranted retraction.

<p>Numbers in parentheses are numbers of articles or of retraction notices. ^Colcollective notice of retraction published. ¹erratum; ²statement. ^acomplete reference of retracted article is listed in table of content; ^bretraction is listed in table of content but reference is lacking; ^creason not described in notice but notice refers to an editorial giving the reason; ^dPDF of one article that was published by a former publisher not marked; ^ePDF accessible but original text, figures, tables deleted; ^fWatermark present but almost invisible. Column “Month” refers to year 2011. Since January 2013, one publisher (Wiley-Blackwell) has modified its retraction notices after learning of our findings.