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Authors
Nagata, Isao https://orcid.org/0000-0002-3546-5209
Takei, Tetsuhiro
Hatakeyama, Junji
Toh, Masafumi
Yamada, Hiroyuki
Fujisawa, Michiko
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Article History
Received: 25 February 2019
Accepted: 12 September 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Yokohama City Minato Red Cross hospital. Because of the anonymous and retrospective nature of this study, requirement of informed consent was waived.
: Not applicable
: The authors declare that they have no competing interests.
