Żurek, Michał http://orcid.org/0000-0001-5031-8007
Wojciechowski, Tomasz http://orcid.org/0000-0002-3639-4422
Niemczyk, Kazimierz http://orcid.org/0000-0003-3013-6403
Article History
Received: 4 June 2023
Accepted: 17 August 2023
First Online: 6 September 2023
Declarations
:
: The authors declare that all methods were carried out in accordance to relevant guidelines and regulations. They also declare that all procedures contributing to this work have been performed in accordance with the ethical standards of the relevant national and institutional committees on human experimentation. The Polish Ministry of Health, which is entitled by the Law of Republic of Poland to process the data of the national database of hospitalization, approved the study protocol. In that case we did not need to obtain local Ethics Committee approval. The study adhered to the tenets of the Declaration of Helsinki for research involving human subjects. The requirement for informed consent was not needed because of the nature of the study. The current study was based on routinely collected and anonymized register data. The law regulating official statistics in Poland implies that anonymized register data can be used for research. The data were extracted from the national database of hospitalization. This database is maintained by the National Health Fund (NHF) and records all medical procedures in public and private hospitals in Poland financed from public sources thus informed consent was not necessary to work on database.This retrospective study abides by the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The authors declare that that the study complies with the current law in Poland.
: Not applicable.
: The authors declare no competing interests.