Text and Data Mining valid from 2019-04-30
Received: 25 October 2018
Accepted: 1 April 2019
First Online: 30 April 2019
: The authors declare that they have no competing interests. This work was done while LMA and DQ were employees of Nokia Bell Labs and LDP was employee of Tesco Labs. The authors’ employers provided support in the form of salaries but did not have any additional role in the study design, data collection and analysis, or preparation of the manuscript. All work was done as part of the respective authors’ research, with no additional or external funding.