This book has been published in good faith that the contents provided by the contributor’s contained herein are original, and is intended for educational purposes only. While every effort is mad to ensure accuracy of information, the publisher and the editors specifically disclaim any damage, liability, or loos incurred, directly or indirectly, form the use or application of any of the contents of this work. If not specifically stated, all figures and tables are courtesy of the editors. Where appropriate, the readers should consult with a specialist or contact the manufacturer of the drug or device.I shall be failing in my duties if I forget contribution and help of Dr. Prashant Upadhyaya, who has been tirelessly typing correcting the manuscript despite his Postgraduate training. He had to bear the brunt of my temperaments. He has been a great support in knowing the view point of what the students expect from a book. Thank you, Prashant for all your help and support.