Text and Data Mining valid from 2019-04-16
Received: 30 January 2019
Accepted: 1 April 2019
First Online: 16 April 2019
Compliance with ethical standards
: Drs Kenji Kawada, Takashi Kobayashi, Takeshi Watanabe, Susumu Inamoto, Takayuki Goto, Rei Mizuno, and Yoshiharu Sakai have no conflicts of interest or financial ties to disclose.
: All the procedures performed in studies involving human participant were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from the patient included in the study.