Funding for this research was provided by:
Food and Health Bureau (No. 11122521)
Shenzhen Science and Technology Innovation Commission (JCYJ20170817173608483)
Received: 26 May 2020
Accepted: 28 October 2020
First Online: 11 November 2020
Ethics approval and consent to participate
: This study was carried out in accordance with the recommendations of Committee on the Use of Human & Animal Subjects of the Hong Kong Baptist University. The protocol was approved by the Department of Health, Hong Kong.
: Not applicable.
: Zhiling Yu is a member of the editorial board. We declare that there are no conflicts of interest.