Funding for this research was provided by:
Forskningsrådet i Sydöstra Sverige (2014/111-31, 2014/111-31, 2014/111-31, 2014/111-31, 2014/111-31, 2014/111-31)
Received: 7 June 2021
Accepted: 28 December 2021
First Online: 14 January 2022
: The study was approved by the Regional Ethical Review Board, Linköping, Sweden, No 2014/111-31. Date 26-03-2016. The study was performed according to the Declaration of Helsinki. Informed consent to participate was not required since this was a register study with ethical approval from the ethical review board, and permission to use data was obtained from the register holder - National Board of Health and Welfare.
: Not applicable
: The authors declare that they have no competing interests.