Funding for this research was provided by:
JSPS KAKENHI (17K10954)
Text and Data Mining valid from 2018-07-18
Received: 11 August 2017
Accepted: 18 June 2018
First Online: 18 July 2018
Ethics approval and consent to participate
: The protocol for this retrospective, case-control, and observational cohort study was approved by the institutional review board, Chiba University (committee’s reference number 220). Written informed consent was obtained from all patients before surgery.
: Not applicable.
: The authors declare that they have no competing interests.
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