Funding for this research was provided by:
governmental assignment (Project 0350-2016-0024)
Text and Data Mining valid from 2019-04-03
Received: 19 December 2018
Accepted: 18 March 2019
First Online: 3 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all individual participants included in the study.