Funding for this research was provided by:
European Commission (2014/344-660)
Text and Data Mining valid from 2018-10-18
Received: 19 July 2018
Accepted: 13 September 2018
First Online: 18 October 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethical approval was obtained for Sweden (Etikprövningsnämnden Stockholm: 2015/1893-31/1), Finland (Ethics Committee, Hospital District of Southwest Finland, :ETMK 158/1801/2015), Russia (Independent Ethics Committee of Smolensk State Medical University #184), Germany (Ethics Committee of Charité—Universitätsmedizin Berlin: EA2/008/15), Latvia (Ethics committee for clinical research at Pauls Stradins Clinical University Hospital: 040815—12E), Poland (Bioethical Commission in IOMEH: 1/2016).
: Informed consent was obtained from all individual participants included in the study.