Received: 1 April 2021
Accepted: 9 July 2021
First Online: 28 July 2021
: This study did not require ethical approval because only secondary data were used in the analysis. Furthermore, the data were de-identified. The outcomes of the analysis do not allow for re-identification and the use of data cannot result in any damage or distress to the participants.
: Not applicable.
: The author declares no competing interests.