Text and Data Mining valid from 2019-09-18
Received: 3 April 2019
Accepted: 2 September 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: The study protocol was approved by the Johns Hopkins School of Public Health Institutional Review Board, which determined the study as non-human subjects’ research (IRB No: 00007896) because this was a secondary analysis and did not include patient identifiers.
: Not applicable
: The authors declare that they have no competing interests.