Text and Data Mining valid from 2019-07-06
Received: 21 January 2019
Accepted: 18 June 2019
First Online: 6 July 2019
Ethics approval and consent to participate
: This study has been approved by the Vilnius Regional Biomedical Research Ethics Committee. Written informed consent was obtained from all participants before their inclusion in the study.
: Not applicable.
: The authors declare that they have no competing interests.