Text and Data Mining valid from 2018-11-01
Received: 17 October 2016
Accepted: 21 August 2018
First Online: 7 November 2018
Change Date: 21 March 2019
Change Type: Correction
Change Details: In this Letter, the spelling of author Benny Trakhtenbrot was corrected; the affiliation for author Sylvain Veilleux was amended; and a new ref. 9 was added to the Abstract with subsequent references renumbered; these errors have been corrected online.
: The authors declare no competing interests.