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Article History

Received: 20 January 2018

Accepted: 7 November 2018

First Online: 20 November 2018

Competing interest

: The authors declare that they have no competing interests.

: This is a retrospective study. For this type of study formal consent is not required based on policy of Ethical Committee by Medical University of Warsaw. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.All patients signed informed consent for using their results of routine tests carried out during hospitalization for research purposes.

: Not applicable.

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