I would like to thank my colleagues at the Loma Linda VA Healthcare Center, Drs. Geir P. Frivold, Gary P. Foster, Alan K. Jacobson, Helme Silvet, Patricia M. Applegate, and Paul A. Levine, for their constant encouragement, suggestions, and corrections. Many of the features of this text are the result of quiet, continuous gentle pressure applied by my friend Geir Frivold. The medical students made countless suggestions about ways to improve the first edition and told me what worked and what did not. My wife, Dr. Linda H. Ferry, was her usual source of wisdom and inspiration. My editor at McGraw-Hill, Quincy McDonald and project manager at ITC, Gita Raman, patiently worked with me to keep the book on schedule and the quality high. Finally, I will never forget my teachers and mentors from my fellowship days, Drs. Michael H. Crawford and Robert A. O'Rourke.