Corrigenda and Addenda
In “Effectiveness of a Web-Based Tailored Intervention With Virtual Assistants Promoting the Acceptability of HPV Vaccination Among Mothers of Invited Girls: Randomized Controlled Trial” J Med Internet Res 2017;19(9):e312 the authors noted several errors.
In the Methods section, under the subheading “Statistical Analyses, the phrase:
Effect sizes of the linear regressions were calculated in R (R Development Core Team)  using Cohen ]ƒ2 (R2 including the outcome at baseline and condition/1− R2 only including the outcome at baseline).
Has been revised to:
Effect sizes for the linear regressions were calculated in R (R Development Core Team)  using Cohen ƒ2 statistic, (R2AB – R2A)/(1 – R2AB), in which B is the variable of interest (ie, condition), A is the set of all other variables (ie, the outcome at baseline), R2AB is the proportion of variance accounting for A and B together, and R2A is the proportion of variance accounted for by A.
This change has not affected the results of the paper.
Additionally, the following degrees have been revised: Mirjam Pot’s degree has been changed from MSc to PhD, Maxine ME Spoelstra’s degree has been changed from BSc to MSc, and Robert AC Ruiter’s degree has been changed from PhD to Prof Dr.
Finally the Corresponding Author section has been revised. Mirjam Pot's email address has been updated from email@example.com to firstname.lastname@example.org. The phone number has been updated from "31 888662213" to "31 643234293", and the fax number (31 888660613) has been removed.
The correction will appear in the online version of the paper on the JMIR Publications website on July 28, 2020, 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 has also been resubmitted to those repositories.
Edited by G Eysenbach; This is a non–peer-reviewed article. submitted 16.07.20; accepted 17.07.20; published 28.07.20Copyright
©Mirjam Pot, Theo GWM Paulussen, Robert AC Ruiter, Iris Eekhout, Hester E de Melker, Maxine EA Spoelstra, Hilde M van Keulen. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 28.07.2020.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), 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 http://www.jmir.org/, as well as this copyright and license information must be included.