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Authors
Hattori, Yujiro
Tahara, Shigeyuki
Aso, Shotaro
Matsui, Hiroki
Fushimi, Kiyohide
Yasunaga, Hideo
Morita, Akio
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Funding
Funding for this research was provided by:
Ministry of Health, Labour and Welfare (19AA2007)
Ministry of Health, Labour and Welfare (H30-Policy-Designated-004)
Ministry of Education, Culture, Sports, Science and Technology (17H04141)
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Article History
Received: 16 December 2019
Accepted: 17 February 2020
First Online: 3 March 2020
Compliance with ethical standards
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: The authors declare no conflicts of interest.
: A written informed consent was not required because of the anonymous nature of the data. The Institutional Review Board at the University of Tokyo approved the study (approval no. 3501), and we followed the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
