Received: 28 August 2020
Accepted: 8 October 2020
First Online: 27 November 2020
Ethics approval and consent to participate
: This study used data available in the public domain and did not concern medical scientific research in which participants or animals were subjected to procedures or were observed. Therefore, it did not require institutional review board approval or informed consent.
: Not applicable.
: The authors declare that they have no competing interests.