**Author details**

Chien-Shan Cheng, Ning Wang and Yibin Feng\* School of Chinese Medicine, The University of Hong Kong, Hong Kong

\*Address all correspondence to: yfeng@hku.hk

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
