Mutsuzaki, Hirotaka
Watanabe, Arata
Komatsuzaki, Tetsuya
Kinugasa, Tomonori
Ikeda, Kotaro
Article History
Received: 6 May 2017
Accepted: 10 January 2018
First Online: 17 January 2018
Ethics approval and consent to participate
: The ethics committee of Ichihara Hospital reviewed and approved this retrospective study. Approval reference number was 1701.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.