Text and Data Mining valid from 2020-01-16
Received: 5 December 2019
Accepted: 6 January 2020
First Online: 16 January 2020
Ethics approval and consent to participate
: This randomized controlled trial was an extension of a previous reported study registered in the University Hospital Medical Information Network (UMIN) clinical trial registry (registry number: UMIN000016158).
: Not applicable
: The authors declare that they have no competing interests.