Text and Data Mining valid from 2019-08-30
Received: 24 April 2019
Accepted: 20 August 2019
First Online: 30 August 2019
Ethics approval and consent to participate
: The study protocol was approved by Toho University Omori Medical Center ethics committee (approval number is M17084) and was conducted in accordance with national and international principles on research conduct, and written informed consent was obtained from all the participants.
: We obtained consent for publication from all the participants when informed consent was written.
: The authors declare that they have no competing interests.