Funding for this research was provided by:
Received: 29 May 2020
Accepted: 31 October 2020
First Online: 12 November 2020
Ethics approval and consent to participate
: The study was approved by the local Ethics Committee (EK 071/11 and EK 277/12) and conforms with the Declaration of Helsinki on ethical principles for medical research involving human subjects.
: Not applicable.
: The authors declare that they have no competing interests.