Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST 103-2410-H-002-099-MY3)
Received: 11 September 2018
Accepted: 21 May 2019
First Online: 30 May 2019
Ethics approval and consent to participate
: Ethics approval was obtained from National Taiwan University’s Research Ethics Committee (#: 20141HS007) and has been classified as exempt on November 14, 2014 in accordance with Social and Behavioral Research Ethical Principles and Regulation of National Taiwan University and governmental laws and regulation of Taiwan.
: As this study involved no participants, consent for publication is not applicable.
: The authors declare that they have no competing interests.