To my parents — who provided me not only with guidance and extraordinary opportunity early on, but also with a lifetime of support and encouragement. To my wife — for her continued orbearance, her extraordinary patience, her sage counsel, and her immeasurable support and To my three children — for their consistent understanding as I worked on this book, for teaching me the things I did not know as a pediatrician, for making me look good as a father, and most important, for all of the joy that they and my wife bring into my life.