Article History
Received: 9 July 2020
Accepted: 20 January 2021
First Online: 17 February 2021
Ethics approval and consent to participate
: The data is from open-source European Centre for Disease Prevention and Control [CitationRef removed]. Data collection did not involve any human subject or personal private data. Commonly available open-source data was used.
: Not required as the data is from open source. Data collection did not involve any human subject or personal private data. Commonly available open-source data was used.
: The authors declare no competing interest.