Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST 106-2410-H-018-016-MY2, MOST H104-2410-H-018-005, MOST H105-2410-H-018-020)
Article History
First Online: 21 February 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 national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from the principals of participating juinior high schools in loco parentis.