Yom-Tov, Elad
Shembekar, Jinia
Barclay, Sarah
Muennig, Peter
Article History
Received: 28 February 2018
Revised: 30 March 2018
Accepted: 9 April 2018
First Online: 27 June 2018
Change Date: 16 August 2018
Change Type: Correction
Change Details: In the original version of the published Article, there was an error in the caption to Table 1 which stated “None of the differences are statistically significant (<i>χ</i><sup>2</sup>, two-sided, <i>p</i> > 0.05)”. This has been changed to “The 18–24 year old are over-represented in the all user treatment population, while the 50–64 year old are underrepresented in both tracked and all user population, <i>p</i>-values were <0.05 for age groups and gender.” This has been corrected in the HTML and PDF version of the Article.
Competing interests
: E.Y.T. is an employee of Microsoft, owner of the Bing search engine. The authors declare no competing interests.