Text and Data Mining valid from 2019-09-03
Received: 1 April 2019
Accepted: 27 August 2019
First Online: 3 September 2019
Ethics approval and consent to participate
: IRB approval in Nihon University Itabashi Hospital: RK-11209-8
: All individual persons consented to publish their data.
: The authors declare that they have no competing interests.