**Author details**

Vangal K. Sashindran1 \* and Rajneesh Thakur2

1 Internal Medicine, Armed Forces Medical Services, India, Prayagraj, India

2 Internal Medicine, Armed Forces Medical Services, India, Kanpur, India

\*Address all correspondence to: vksashindran@gmail.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.
