Text and Data Mining valid from 2019-09-06
Received: 24 April 2019
Accepted: 24 July 2019
First Online: 6 September 2019
Ethics approval and consent to participate
: Our analyses used only secondary data gathered from existing governmental databases. No primary data were collected as part of this research and no personally identifiable information is included in our results.
: Not applicable.
: The authors declare that they have no competing interests.