Received: 17 February 2019
Accepted: 8 May 2019
First Online: 16 May 2019
Ethics approval and consent to participate
: All patients provided signed informed consent to allow their clinical and radiologic data to be used for research programs.The name of the board is the Institutional Review Board of School of Medicine, Keio University. Approval number is #2011266.
: 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.