Received: 16 October 2020
Accepted: 22 March 2021
First Online: 29 April 2021
: The research was approved by the Medical Ethical Committee, Centro Hospitalar Conde de São Januário, Health Bureau, Macao SAR, China. Informed consent was acquired from all participants when they accessed the electronic questionnaire via web-based systems before answering the questionnaires, while written informed consent was acquired and collected if a participant used a paper questionnaire. For participants aged between 15 and 18 years, written parental consent was waived by Medical Ethical Committee, Centro Hospitalar Conde de São Januário, Health Bureau based on the following: 1) the risk of the research to the participants was relatively low compared to the general risk encountered in daily life; 2) quarantine and infection control procedures precluded the possibility of obtaining written parental consent; and 3) only those aged 15 years or above were enrolled, as they are more capable of expressing their wishes for participation and better understand the research consent than younger people.
: Not applicable.
: The authors declare that they have no competing interests.