**Author details**

Farida Nazeer, Rejnish Ravi Kumar, Malu Rafi, Lekha M. Nair, Kainickal Cessal Thommachan\* and Kunnambath Ramadas Department of Radiation Oncology, Regional Cancer Centre, Thiruvananthapuram, Kerala, India

\*Address all correspondence to: drcessalthomas@gmail.com

© 2021 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.
