AUTHOR=Tattersall Andy , Carroll Christopher TITLE=Corrigendum: What Can Altmetric.com Tell Us About Policy Citations of Research? An Analysis of Altmetric.com Data for Research Articles From the University of Sheffield JOURNAL=Frontiers in Research Metrics and Analytics VOLUME=3 YEAR=2018 URL=https://www.frontiersin.org/journals/research-metrics-and-analytics/articles/10.3389/frma.2018.00033 DOI=10.3389/frma.2018.00033 ISSN=2504-0537