Fan, Hui-Ya
Chen, Zi-Lin
Article History
Received: 3 December 2017
Revised: 16 May 2018
Accepted: 21 June 2018
First Online: 11 July 2018
Compliance with ethical standards
:
: The authors declare that they have 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 Helsinki declaration and its later amendments or comparable ethical standards.For this type of study formal consent is not required.