**Acknowledgements**

The corresponding author expresses gratitude to all the contributing authors and anonymous reviewers for their valuable contribution and suggestions of the received manuscripts. The authors also thank Savitribai Phule Pune University, Pune, India for providing the necessary infrastructure during the compilation of this chapter. We also thank our colleagues, whose work has been cited in this article, for their inspiration. Jay Dave and Sayali Chandekar thank Lady Tata Memorial Trust and Savitribai Phule Pune University, India for doctoral fellowship respectively.
