Funding for this research was provided by:
Uniwersytet Medyczny w Lodzi (503/8-000-04/503-81-002-19.)
Received: 3 January 2020
Accepted: 3 August 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: The study was conducted in accordance with the International Conference on Harmonization Guideline for Good Clinical Practice and the Declaration of Helsinki. The approval of local ethical committee was obtained before commencing the study. Written, informed consents from all participants of the study or their legal representatives were obtained.
: Not applicable.
: The prefilled pens used in the study were donated to the Department of Pediatric Cardiology and Rheumatology by Medac GmbH.