Liu, Lee
Article History
Received: 26 October 2017
Accepted: 30 April 2018
First Online: 8 June 2018
Compliance with ethical standards
:
: The author confirms that this research involved no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.