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Article History

Received: 17 June 2020

Accepted: 27 October 2020

First Online: 2 November 2020

Compliance with ethical standards

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: Yuki Ishihara, MD, Kazuyuki Matsumoto, MD, PhD, Hironari Kato, MD, PhD, Koichiro Tsutsumi, MD, PhD, Takeshi Tomoda, MD, PhD, Akihiro Matsumi, MD, Kazuya Miyamoto, MD, Tatsuhiro Yamazaki, MD, Yosuke Saragai, MD, Yuki Fujii, MD, Daisuke Uchida, MD, PhD, Shigeru Horiguchi, MD, PhD, and Hiroyuki Okada MD, PhD have no conflicts of interest or financial ties to disclose.