Text and Data Mining valid from 2018-07-17
Received: 13 March 2018
Accepted: 12 July 2018
First Online: 17 July 2018
Ethics approval and consent to participate
: The Ethics Committee at Nippon Medical School Hospital waived the need for written informed consent from the participants for this retrospective review of medical records and approved the study (Registration no. 29–07-781). This study also conformed to the Helsinki Declaration (2013) and local legislation.
: Not applicable.
: The authors declare that they have no competing interests.
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