Text and Data Mining valid from 2019-12-01
Received: 25 April 2019
Accepted: 1 December 2019
First Online: 18 December 2019
Ethics approval and consent to participate
: This study was performed in accordance with the Declaration of Helsinki and has been approved by the local ethics committee of Yokohama Daiichi Hospital; approval #: 2017–006263. Consent to participate was given in written format. Ethics Committee Member: Seiji Takasaki, Shinichi Masai, and Tetsuo Chiba.
: Not applicable.
: The authors declare that they have no competing interests.