**Author details**

Fozia Masood Faculty of Pharmacy, University of Lahore, Lahore, Pakistan

\*Address all correspondence to: fozia.masood@pharm.uol.edu.pk

© 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.
