Text and Data Mining valid from 2020-01-13
Received: 16 April 2019
Accepted: 8 January 2020
First Online: 13 January 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Research Center for Promoting Excellence in Professional Training (reference number 836/20.04.2018), University of Pitesti. Participants gave written informed consent before inclusion in the study.
: Not applicable.
: The authors declare that they have no competing interests.