Ropponen, Annina
Wang, Mo
Narusyte, Jurgita
Kärkkäinen, Sanna
Blom, Victoria
Svedberg, Pia
Funding for this research was provided by:
Karolinska Institute
Article History
Received: 3 January 2021
Accepted: 27 April 2021
First Online: 20 May 2021
Declarations
:
: The study protocol was designed and performed according to the principles of the Helsinki Declaration. The ethical vetting was performed and approved by the Regional Ethical Review Board of Stockholm, Sweden (Dnr: 2007/524–31). For this project the Regional Ethical Review Board of Stockholm stated that the consent to participate was not applicable in these type of large register studies. None of the authors had access to any kind of identifying information.
: Not applicable.
: None declared.