Text and Data Mining valid from 2019-12-01
Received: 26 June 2019
Accepted: 15 November 2019
First Online: 3 December 2019
Ethics approval and consent to participate
: The institutional ethics committee at Tomishiro Central Hospital approved the present study and waived informed consent because of the observational nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.