Text and Data Mining valid from 2019-07-31
Received: 22 January 2018
Accepted: 25 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: This study was approved by the University of Iowa Institutional Review Board (IRB ID#: 201206719) and all subjects were provided with an informational consent letter and provided verbal consent prior to participation in this study. The University of Iowa Institutional Review Board deemed this project as exempt and not requiring verbal consent because all data was aggregated and no individual identifying information was collected.
: Not applicable.
: The authors declare that they have no competing interests.