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Article History

Received: 25 July 2023

Accepted: 13 March 2024

First Online: 20 March 2024

Declarations

:

: This study medical records have been obtained from the National Cancer Center Archive Medical Records which was approved by the general research agreement of archive materials by the National Cancer Center. The original document was translated from Mongolian to English language in the attachment (general research agreement # 2023 May 27 − 21/57). In addition to that, this study was also approved by the research ethics at the Mongolian National University of Medical Sciences, Ethical Review Committee (Ethical Reference Number 2021/3–07). Since our study design is retrospective, the Mongolian National University of Medical Sciences, Ethical Approval Committee waived for the informed consent.

: Not applicable.

: The authors declare that there are no competing interests.