JMIR J Med Internet Res Journal of Medical Internet Research 1438-8871 JMIR Publications Toronto, Canada v22i7e22565 32721923 10.2196/22565 Corrigenda and Addenda Corrigenda and Addenda Correction: Effectiveness of a Web-Based Tailored Intervention With Virtual Assistants Promoting the Acceptability of HPV Vaccination Among Mothers of Invited Girls: Randomized Controlled Trial Pot Mirjam PhD 1
Netherlands Organization for Applied Scientific Research (TNO) Child Health Schipholweg 77 Leiden, 2316 ZL Netherlands 31 643234293 mirjampot90@gmail.com
2 https://orcid.org/0000-0003-2522-1750 Paulussen Theo GWM PhD 1 https://orcid.org/0000-0003-4978-6246 Ruiter Robert AC Prof Dr 2 https://orcid.org/0000-0001-5017-3258 Eekhout Iris PhD 1 3 https://orcid.org/0000-0002-0030-1458 de Melker Hester E PhD 4 https://orcid.org/0000-0001-9100-1639 Spoelstra Maxine EA MSc 5 https://orcid.org/0000-0002-4137-4223 van Keulen Hilde M PhD 1 https://orcid.org/0000-0002-8194-3478 Netherlands Organization for Applied Scientific Research (TNO) Child Health Leiden Netherlands Department of Work and Social Psychology Maastricht University Maastricht Netherlands VU University Medical Center Epidemiology & Biostatistics Amsterdam Netherlands National Institute for Public Health and the Environment (RIVM) Centre for Infectious Disease Control Bilthoven Netherlands Department of Psychology Leiden University Leiden Netherlands Corresponding Author: Mirjam Pot mirjampot90@gmail.com 7 2020 28 7 2020 22 7 e22565 16 7 2020 17 7 2020 ©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. 2020

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 https://www.jmir.org/2017/9/e312/

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) [45] 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) [45] 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 mirjam.pot@tno.nl to mirjampot90@gmail.com. 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.