Received: 11 August 2021
Accepted: 22 September 2021
First Online: 21 October 2021
: All methods were carried out in accordance with relevant guidelines and regulations and have been performed in accordance with the ExternalRef removed.
: The study was granted ethics approval by a national ethics committee and written informed consent was obtained from the participants or their guardians before the survey.
: Not applicable
: The authors declare that they have no competing interests.