**Author details**

Abhishek Kumar, Pratishtha Yadav and Rakesh Garg\* Department of Onco-Anaesthesia and Palliative Medicine, BRAIRCH, All India Institute of Medical Sciences (AIIMS), New Delhi, India

\*Address all correspondence to: drrgarg@hotmail.com

© 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.
