To my parents (Saeeda Azhar and Azhar Hussain), for all the care and love you have provided to us. To my wife (Wajiha Saad) and daughters (Zariyah Saad and Fabiha Saad) for creating peaceful environment for me to prosper. To all my siblings (Fareeha, Ashar, and Anas) for always supporting me. Finally, to all my mentors, colleagues and juniors for a great inspiration to me, thank you all.
I dedicate this book to my family for their constant support, encouragement, patience, and love. Thank you as well to my mentors, teachers, and colleagues, for shaping my medical education and making me the physician I am today. Most of all, I dedicate this book to the patients who have entrusted me with their care.