Funding for this research was provided by:
Japan Society for the Promotion of Science (JP16H06641)
Received: 25 April 2018
Accepted: 5 February 2019
First Online: 11 February 2019
Ethics approval and consent to participate
: This study was approved by the Ethnic Committee at Tohoku University School of Medicine.(Number: 2017–1-972). Written informed consents were received from all patients before the surgery.
: 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.