Received: 30 October 2019
Accepted: 11 June 2020
First Online: 21 June 2020
Compliance with ethical standards
: Yasuhiro Kodera has received grants and personal fees from Taiho Pharmaceutical outside the submitted work. All other authors have no relevant disclosures with regard to this paper to declare.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions.
: Informed consent or substitute for it was obtained from all patients for their being included in the study.