Received: 10 April 2019
Accepted: 23 June 2019
First Online: 9 July 2019
Ethics approval and consent to participate
: Ethics approval was obtained from the Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster (HKU/HA HKW IRB) (reference number: UW 16–102) and Hospital Authority Kowloon West Cluster Research Ethics Committee (reference number: KW/EX-17-028(108–07)).As stated on the information sheet in the questionnaire packet, consent to participate was obtained by participants sending back a completed survey, he/she may decide whether or not to participate and they may withdraw anytime with no negative consequences.
: Not applicable.
: The authors declare that they have no competing interests.