Text and Data Mining valid from 2019-04-15
Received: 13 July 2018
Accepted: 5 March 2019
First Online: 15 April 2019
Compliance with ethical standards
: The study was approved by the Ethics Committee of Clinical Centre Kragujevac, Serbia. All subjects voluntarily participated in the study and the consent was obtained from each subject.
: The authors declare that they have no conflict of interest.