Funding for this research was provided by:
Ministarstvo prosvete, nauke i tehnološkog razvoja (OI170547)
Received: 6 February 2019
Accepted: 10 October 2019
First Online: 26 October 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of School of Medicine, University of Belgrade, Serbia.
: Not applicable.
: The authors declare that they have no competing interests<b>.</b>