Yip, P. K. F.
Article History
Received: 22 February 2019
Accepted: 7 April 2019
First Online: 19 April 2019
Compliance with ethical standards
:
: The Author declared no conflict of interest.
: The study complied with the current laws of the country in which they were performed.
: The study including human participants has been performed in accordance with the ethical standards of the Declaration of Helsinki and its later amendment.
: Informed consent was obtained from all individual participants included in the study.