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Published on 13.08.19 in Vol 21, No 8 (2019): August

This paper is in the following e-collection/theme issue:

    Corrigenda and Addenda

    Correction: The Search for Consumers of Web-Based Raw DNA Interpretation Services: Using Social Media to Target Hard-to-Reach Populations

    1Division of Emerging Media, Boston University College of Communication, Boston, MA, United States

    2Department of Community Health Sciences, Boston University School of Public Health, Boston, MA, United States

    Corresponding Author:

    Catharine Wang, PhD, MSc

    Department of Community Health Sciences

    Boston University School of Public Health

    801 Massachusetts Avenue

    Boston, MA, 02118

    United States

    Phone: 1 617 358 1475


    “The Search for Consumers of Web-Based Raw DNA Interpretation Services: Using Social Media to Target Hard-to-Reach Populations” (J Med Internet Res 2019;21(7):e12980) contained a typographical error in the Results section within the subsection “Demographic Comparisons Across Platforms and Tracking Methods” under the heading “Differences Between Tracking Methods”. The proportion of female respondents among those recruited using click-tracking was reported as “(43/49, 73%)” but should have been “(43/59, 73%)” to be consistent with Figure 6. This error has been corrected and the sentence now reads as follows:

    Female respondents made up the majority in both cases, but were more prevalent among those recruited using conversion-tracking (124/145, 85.5%), compared with those recruited using click-tracking (43/59, 73%).

    Additionally, incorrect sample sizes were noted in the second paragraph of the Discussion. The value for Facebook was listed as n=168 but should have been n=159; the value for Twitter was listed as n=170 but should have been n=167; and the value for Reddit was listed as n=114 but should have been n=112 to be consistent with values already reported in the Results section. The errors have been corrected and the sentence now reads as follows:

    Nearly identical sample sizes were obtained via paid Facebook (n=159) and Twitter (n=167) advertising, as well as the sample obtained via unpaid posting on Reddit (n=112).

    The corrections will appear in the online version of the paper on the JMIR website on August 13, 2019, together with the publication of this correction notice. Because this was made after submission to PubMed, PubMed Central, and other full-text repositories, the corrected article also has been resubmitted to those repositories.

    Edited by G Eysenbach; This is a non–peer-reviewed article. submitted 01.08.19; accepted 05.08.19; published 13.08.19

    ©Tiernan J Cahill, Blake Wertz, Qiankun Zhong, Andrew Parlato, John Donegan, Rebecca Forman, Supriya Manot, Tianyi Wu, Yazhu Xu, James J Cummings, Tricia Norkunas Cunningham, Catharine Wang. Originally published in the Journal of Medical Internet Research (, 13.08.2019.

    This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on, as well as this copyright and license information must be included.