Text and Data Mining valid from 2020-03-12
Received: 23 January 2019
Accepted: 17 February 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: Not applicable. The Ministry of Health, Eritrea determined that no ethical approval was required since we analyzed de-identified, delinked aggregated data.
: Not applicable.
: The authors declare that they have no competing interests.