**Acknowledgements**

The author-editor places on record high appreciation and gratefulness to Ms. Marina Dusevic, the Author Service Manager, IntechOpen, for her meticulous care and highly efficient technical guidance, in bringing out this book in a very successful manner. Gratefully, I acknowledge the warmth, love, care and efficient assistance of my daughter Dr. R. Rijula Raj MPT and my son Er. R. Rixon Raj during the edition of this book, I thankfully acknowledge Er. S. Pavithraj for his expert computer assistance. My highest regards to R. Celin Rani for her limitless love, care and support. My deep sense of gratitude and thanks to the IntechOpen publishers, for collaborating with me for fourth book, in succession. May all our efforts bring goodness to the poorest of the poor in the world, by prevention of diseases and promotion of health, true to the wish of God and man.
