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Article History

Received: 9 June 2020

Accepted: 11 September 2020

First Online: 26 September 2020

Compliance with ethical standards

:

: None.

: 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. The study was approved by the Tokyo Women’s Medical University Ethics Committee, number 5596.

: Informed consent was obtained from all individual participants included in the study.

: Not applicable.

: Not applicable..