Open Access
Volume 9, Number 3, September 2019
Article Number 17
Number of page(s) 7
Published online 27 August 2019

© Author(s) 2019. This article is published with open access by China Medical University

Licence Creative Commons
Open Access This article is distributed under terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided original author(s) and source are credited.