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Bhandari M, Guyatt GH, Kulkarni AV, Devereaux PJ, Leece P, Bajammal S, Heels-Ansdell D, Busse JW (2014) Perceptions of authors' contributions are influenced by both byline order and designation of corresponding author. Journal of Clinical Epidemiology 67: 1049-1054

Abstract
Objectives
We explored how readers interpret authors' roles based on authorship order and corresponding author.

Study Design and Setting
We conducted a cross-sectional survey of all 291 Surgical and Medical Chairpersons across North America. We developed hypothetical study and authorship bylines with five authors varying the corresponding author as first or last author. Respondents reported their perceptions about the authors' roles in the study and the most prestigious authorship position. We used multinomial regression to explore the results.

Results
One hundred sixty-five chairpersons (response rate: 57%) completed our survey. When the first author was designated as corresponding author, most of the respondents assumed that this author had taken the lead in study design (55.3%) and analysis and interpretation of data (51.2%). When the last author (fifth) was designated as corresponding, perceptions of the first author's role in study concept and design (odds ratio [OR] = 0.25, 95% confidence interval [CI]: 0.15, 0.41) and analysis and interpretation of results (OR = 0.22, 95% CI: 0.13, 0.38) decreased significantly. Overall prestige of the last author position increased significantly when designated as corresponding author (OR = 4.0, 95% CI: 2.4, 6.4).

Conclusions
Academic department chairs' perception of authors' contributions was influenced by corresponding author designation. Without authors' explicit contributions in research articles, many readers may draw false conclusions about author credit and accountability.
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