Text and Data Mining valid from 2018-07-27
Received: 9 August 2017
Accepted: 26 June 2018
First Online: 27 July 2018
Ethics approval and consent to participate
: This study was a retrospective study of existing records, and a waiver of informed consent was approved by the Mayo Clinic Institutional Review Board in accordance with 45 CFR 46.116 (Approval #14–00603).
: Not applicable.
: The authors declare that they have no competing interests.
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