Funding for this research was provided by:
Hong Kong College of Family Physicians (1)
Received: 23 November 2016
Accepted: 18 April 2018
First Online: 9 May 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of The University of Hong Kong/Hospital Authority Hong Kong West Cluster (HKU/HA HKW IRB). Written informed consent was obtained from all participants.
: The authors declare that they have no competing interests.
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