Text and Data Mining valid from 2019-09-10
Received: 1 May 2019
Accepted: 27 August 2019
First Online: 10 September 2019
Ethics approval and consent to participate
: This human subject research was deemed exempt as it involved the study of existing data and information was recorded in such a manner that subjects could not be identified. This study was deemed exempt by the Human Protections Administrator at the Army Medical Department Center and School and was approved by the Institutional Review Board at Walter Reed National Military Medical Center.
: Not Applicable
: The authors declare that they have no competing interests.