Text and Data Mining valid from 2019-04-02
Received: 24 July 2018
Accepted: 26 March 2019
First Online: 2 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: There is no funding source.
: The technique had been approved by an ethical committee. IRB approval by the Medical University of Lodz RNN/258/13/KE.