Document is current

Article History

Received: 10 July 2017

Accepted: 22 March 2018

First Online: 3 April 2018

Ethics approval and consent to participate

: This study was approved by the Human Subjects Review Board at the University of Arizona with a waiver of consent as this study used anonymous aggregated data. This study was considered exempt by the Microsoft Institutional Review Board.

: Not applicable.

: EYT is an employee of Microsoft, owner of Bing.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.