Text and Data Mining valid from 2020-02-13
Received: 26 August 2019
Accepted: 17 December 2019
First Online: 13 February 2020
Ethics approval and consent to participate
: This review was approved by the ethics committee in Teikyo University School of Medicine, Tokyo, Japan (TUIC-COI 18-1494).
: Informed consent for publication was taken on document independently.
: The authors declare that they have no competing interests.