Funding for this research was provided by:
Received: 22 January 2021
Accepted: 28 May 2021
First Online: 9 June 2021
: Patients and guardians are informed about the register, and approval of registration is documented in the patient’s electronic medical file. An opt-out approval is the current law and regulation in Sweden. The study was approved by the Regional Ethical Review Board in Stockholm (number 2014/381–31/5).
: Not applicable.
: The authors declare that they have no competing interests.