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Authors
Chung, Yida Y. H. https://orcid.org/0000-0002-4213-159X
Shek, Daniel T. L.
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Article History
First Online: 5 February 2018
Compliance with Ethical Standards
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: The study was approved by the Human Subject Ethics Sub-committee (HSESC) of The Hong Kong Polytechnic University as well as the participating drug treatment organizations. Written informed consent was obtained from the participants.
: The authors declare that they have no conflict of interest.
