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Authors
Czajkowska, Agnieszka
Mikulska, Aleksandra
Poniewierska, Martyna
Suchan, Agnieszka
Sierakowski, Maciej
Pawiński, Tomasz
Kocur, Arkadiusz
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Article History
Received: 3 September 2025
Revised: 1 November 2025
Accepted: 6 November 2025
First Online: 19 November 2025
Declarations
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: This study was conducted in accordance with the principles of the Declaration of Helsinki. The presented study presented results of routine diagnostic testing for methotrexate in patients treated at the Children’s Memorial Institute in Warsaw, Poland. Approval reference number: 2377/2023.
: Informed consent was obtained from all subjects involved in the study as routine diagnostic process of MTX measurements in the Children’s Memorial Health Institute in Warsaw, Poland.
: The authors declare that they have no conflicts of interest.
