Ikuyama, Yuichi
Ushiki, Atsuhito http://orcid.org/0000-0001-8158-6100
Kosaka, Makoto
Akahane, Jumpei
Mukai, Yuichi
Araki, Taisuke
Kitaguchi, Yoshiaki
Tateishi, Kazunari
Urushihata, Kazuhisa
Yasuo, Masanori
Yamamoto, Hiroshi
Hanaoka, Masayuki
Article History
Received: 26 November 2019
Accepted: 13 May 2020
First Online: 20 May 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Shinshu University School of Medicine (Matsumoto, Japan; approval no.: 4063). The authors assert that all procedures contributing to this work complied with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975 that was revised in 2008. Informed consent was not required because of the retrospective study design. The study used an opt-out consent model, and patients could choose to opt out at any time and have their data removed from the registry.
: Not applicable.
: The authors declare that they have no competing interests.