Funding for this research was provided by:
Health and Medical Research Fund, Hong Kong Special Administrative Region (13121262)
Theme-based Research Scheme, Hong Kong University Grants Committee (T11-705/14-N)
Text and Data Mining valid from 2020-03-27
Received: 17 July 2019
Accepted: 19 March 2020
First Online: 27 March 2020
Ethics approval and consent to participate
: Verbal or online informed consent was obtained prior to the survey, from all participants and parents/caregivers of the participants aged below 16 years. Ethics approval has been obtained from the Institutional Review Board (IRB) of the University of Hong Kong/Hospital Authority Hong Kong West Cluster (UW 13–420). The verbal/online consent was approved by the IRB for practical reason due to the nature of the survey and considering only minimal personal information were collected.
: Not applicable.
: B. J. Cowling has received research funding from Sanofi for a study of influenza vaccine effectiveness in China, and honoraria from Sanofi and Roche. Other authors declare that they have no conflict of interest