Text and Data Mining valid from 2019-06-04
Received: 25 April 2019
Accepted: 26 May 2019
First Online: 4 June 2019
Compliance with ethical standards
: There is no conflict of interest. We confirm that all the authors of this submission have understood and approved the journal’s licensing policy.
: Our research involving human participants.
: Our study was approved by the local Ethics Committee regarding Helsinki Declaration and written informed consent was obtained from all participants.