Berger, Simon Girmai http://orcid.org/0000-0003-4744-3637
Witczak, Birgit Nomeland http://orcid.org/0000-0002-3136-4283
Reiseter, Silje http://orcid.org/0000-0002-7566-8043
Schwartz, Thomas http://orcid.org/0000-0002-6633-0497
Andersson, Helena http://orcid.org/0000-0002-4965-2646
Hetlevik, Siri Opsahl http://orcid.org/0000-0001-9553-2322
Berntsen, Kristin Schjander http://orcid.org/0000-0002-6476-8815
Sanner, Helga http://orcid.org/0000-0001-7226-066X
Lilleby, Vibke http://orcid.org/0000-0002-4944-0328
Gunnarsson, Ragnar http://orcid.org/0000-0002-9846-6620
Molberg, Øyvind http://orcid.org/0000-0003-4493-8853
Sjaastad, Ivar http://orcid.org/0000-0002-0131-2036
Stokke, Mathis Korseberg http://orcid.org/0000-0002-8869-8153
Funding for this research was provided by:
Norges Forskningsråd
University of Oslo
Article History
Received: 9 December 2022
Accepted: 6 March 2023
First Online: 18 March 2023
Declarations
:
: Simon Girmai Berger, Birgit Nomeland Witczak, Silje Reiseter, Thomas Schwartz, Helena Andersson, Siri Opsahl Hetlevik, Kristin Schjander Berntsen, Helga Sanner, Vibke Lilleby, Ragnar Gunnarsson, Øyvind Molberg, Ivar Sjaastad and Mathis Korseberg Stokke 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. The study was approved by the Regional Committee for Medical and Health Research Ethics (REC) in Norway (REC South East 2012/1432, 2013/1039, 2012/1721 and 2011/895).
: All patients and controls signed written informed consent forms to participate in the study.
: Written informed consent for publication was obtained from all patients and controls.