Cheung, Kin
Ching, Siu Yin Shirley
Chan, Amy
Cheung, Doris
Cheung, Suk Yee Polly
Article History
Received: 23 February 2017
Accepted: 30 May 2017
First Online: 14 June 2017
Compliance with ethical standards
: Ethical approval (reference number: HSEARS20130909002-03) has been granted by The Hong Kong Polytechnic University, and the access permission has been obtained from the corresponding organizations.
: The authors declare that they have no competing interests.