Received: 5 March 2020
Accepted: 22 June 2020
First Online: 1 July 2020
Ethics approval and consent to participate
: This article does not contain any studies with human participants or animals performed by any of the authors. No ethical committee approval is required since this study is performed on the publicly available Internet data. For this type of study, formal consent is not required.
: Not Applicable.
: The authors declare that they have no competing interests.