Text and Data Mining valid from 2020-03-30
Received: 9 January 2020
Accepted: 19 March 2020
First Online: 30 March 2020
Ethics approval and consent to participate
: This study was approved by the ethical committee of our hospital (approval number 2014–0399) and performed according to the guidelines in the Helsinki Declaration for biomedical research involving human subjects (Clinical trial registration number: UMIN 000016497). All study participants provided informed written consent prior to be enrolled in this observational study.
: Not Applicable.
: The authors declare that they have no competing interests.