Open Access
Volume 8, Number 4, December 2018
Article Number 27
Number of page(s) 4
Published online 26 November 2018

© Author(s) 2018. 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.