Funding for this research was provided by:
World Health Organization (K18003)
Received: 4 June 2020
Accepted: 26 August 2020
First Online: 4 September 2020
Ethics approval and consent to participate
: Administrative permissions were required to access the data used in this study. The permission was granted by the DPC Research Institute.
: Not applicable.
: The authors declare that they have no competing interests.