About this article
Article Category: Discussion
Published Online: Dec 31, 2018
Page range: 241 - 247
Received: May 18, 2018
Accepted: Sep 10, 2018
DOI: https://doi.org/10.1515/fon-2018-0035
Keywords
© 2018 Shi-Fan Han et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Figure 1
