Definitions of authorship, contributions for deserved authorship and authorship practices^*.

*Abbreviations: ICMJE, International Committee of Medical Journal Editors; APA, American Psychological Association; NIH, National Institutes of Health, USA; RCR, responsible conduct of research. aPartial or full replication or modification of questionnaire by Spiegel and Keith Spiegel, 1970 [11]. bSub-analysis of data from Flanagin et al [38]. cThe same study as Birnholtz, 2006 [79]. dHouse and Seeman [119] and Seeman and House [126] present results from the same study.