Norman, Christer
Svensson, Mikaela
Schmidt, Ingrid
Bergfeldt, Vendela S.
Obeid, Ragda
Ternhag, Anders
Struwe, Johan L.
Funding for this research was provided by:
Karolinska Institute
Article History
Received: 17 August 2021
Accepted: 2 February 2022
First Online: 8 February 2022
Declarations
:
: All methods were carried out in accordance with relevant guidelines and regulations. All data were obtained from population registers kept by the National Board of Health and Welfare (NBHW). NBHW a governmental agency that according to Swedish law have the right to collect, analyse and distribute Swedish health-care data on quality aspects of Swedish health care. Thus, obtaining approval from an external ethic committee in order to publish results based on these data is not necessary according to general legislation and is done regularly. The registers are highly protected: only pseudonymised data are used and all work is conducted within the Agency’s firewall.
: Not applicable.
: None of the authors have declared any conflict of interest.