Sato, Ryuichi
Takao, Masaki
Hamada, Hidetoshi
Sakai, Takashi
Marumo, Keishi
Sugano, Nobuhiko
Article History
Received: 11 June 2018
Accepted: 13 August 2018
First Online: 22 August 2018
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Formal consent is not required for this type of retrospective cohort study.