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Article History

Received: 5 September 2019

Accepted: 18 February 2020

First Online: 25 February 2020

Compliance with ethical standards

:

: Shigeki Machida has received research grants from Bayer Yakuhin, Ltd. (Bayer).

: All procedures performed in studies involving human participants were in accordance with ethical standards of Dokkyo Medical University Saitama Medical Center and with 1964 Helsinki Declaration and its later amendments.

: This article does not contain any studies with animals performed by any of the authors.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of Dokkyo Medical University Saitama Medical Center and with the 1964 Helsinki Declaration and later amendments or comparable ethical standards.

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