Text and Data Mining valid from 2019-08-17
Received: 17 May 2019
Revised: 10 July 2019
Accepted: 22 July 2019
First Online: 17 August 2019
Compliance with ethical standards
: This work was approved by The Ethics Committee of Boğaziçi University, where the study was started.
: The authors declare that they have no conflict of interest.