Amazon.com description: Product Description: This new edition of PCD presents the most accurate and complete demographic reference on the physician marketplace. It provides extensive data on trends, characteristics and distribution of almost 813,000 physicians. Data includes trends on major professional activity, specialties, age, and gender; characteristics by age and gender, including country, year and school of graduation, and specialties; and distribution by state, age, and gender as well as specialty and activity by location.All data are derived from the American Medical Association Physician Masterfile, which obtains data from continuous monitoring of physicians in the US through various surveys. It is the most comprehensive and accurate source of information for MDs in the US.