**Author details**

Karim Ali National University of Singapore, Singapore

\*Address all correspondence to: karim.ali@u.nus.edu

© 2020 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.
