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. 2017 Nov 8;3(11):e1700404. doi: 10.1126/sciadv.1700404

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Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 6 — Incidence of ghost contributorship (authors not listed with contributions they have made) by senior authors (A) and junior authors (B). Incidence of guest contributorship (authors listed with contributions not made) by senior authors (C) and junior authors (D). By seniority of respondent.