Text and Data Mining valid from 2016-06-06
Received: 25 February 2016
Accepted: 13 May 2016
First Online: 6 June 2016
Change Date: 18 July 2016
Change Type: Erratum
Change Details: In the version of this article initially published, the year in the received date on the first page was given as “2015,” but should be “2016.” The error has been corrected for the print, PDF and HTML versions of this article.
: D.K., J.K., J.K.H. and J.-S.K. have filed a patent application based on this work.