Nagashima, Takao https://orcid.org/0000-0003-0620-6774
Kamata, Yasuyuki https://orcid.org/0000-0002-8174-3038
Iwamoto, Masahiro https://orcid.org/0000-0002-3616-1303
Okazaki, Hitoaki https://orcid.org/0000-0002-0277-5673
Fukushima, Noriyoshi https://orcid.org/0000-0002-4522-9007
Minota, Seiji https://orcid.org/0000-0003-4084-6804
Article History
Received: 14 January 2019
Accepted: 14 February 2019
First Online: 21 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study complied with the guidelines of the Declaration of Helsinki and was approved by Jichi Medical University’s Institutional Review Board (No. 17–062, May 29, 2017). The requirement for the need to obtain written informed consent from the patients was waived in accordance with the relevant Japanese regulations.