Text and Data Mining valid from 2018-02-15
Received: 5 September 2017
Accepted: 29 January 2018
First Online: 15 February 2018
: NIRTI SA, Wierzbice, Poland rented the SAS-Monitor device to the authors. Drs. Andrzej Frydrychowski, Wojciech Guminski and Pawel J. Winklewski are stakeholders in NIRTI SA (www.nirt.pl).