Funding for this research was provided by:
St. Josef's Hospital Fund, Reykjavik, Iceland (N/A)
Landspitali University Hospital Research Fund, Reykjavik, Iceland (N/A)
Icelandic Research Fund of the Icelandic Centre for Research, Reykjavik, Iceland (163172-051)
Received: 26 December 2019
Accepted: 21 July 2020
First Online: 4 August 2020
Ethics approval and consent to participate
: The study has been approved by the National Research Ethics Committee of Iceland (VSN-14-028), and all subjects signed an informed consent. The study was conducted in accordance with the Helsinki Declaration latest revision of 2013.
: Not applicable.
: The authors declare that they have no competing interests.