Text and Data Mining valid from 2019-04-01
First Online: 4 April 2019
Ethics approval and consent to participate
: This study was a retrospective study of existing records. The study and a waiver of informed consent were approved by Mayo Clinic Institutional Review Board in accordance with 45 CFR 46.116 (Approval #17–003030).
: Not applicable; the manuscript does not contain individual level of data.
: The authors declare that they have no competing interests.
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