Funding for this research was provided by:
Lastentautien Tutkimussäätiö (not applicable)
Received: 11 February 2020
Accepted: 24 November 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: This study was retrospective and register-based. Patients were not contacted for study purposes and the study did not affect their treatment. Thus, approval from an ethics committee was not required by Finnish legislation. The authorities of the Helsinki University Hospital approved the study protocol and provided permission to access the patient data (§ 10, 11.11.2015). Informed patient consent to access medical records was not required. As General Data Protection Regulation [CitationRef removed] was implemented after the study had already started (22.5.2018), the study protocol and data processing were confirmed to be in accordance with it. Data were gathered from existing patient records and no new data were combined to it. All personally identifiable information was removed before analysis.
: Not applicable.
: The authors declare that they have no competing interests.