Chronic diseases-cardiovascular disease, cancer, chronic respiratory disease and diabetes-are not only the principal cause of world-wide mortality but also are now responsible for a striking increase in the percentage of sickness in developing countries still grappling with the acute problems of infectious diseases. The "double disease burden" - the onset of significant mortality from chronic, non-communicable diseases while mortality from communicable diseases remains high - is a problem of developing countries. Developed countries had the historical "luxury" of dealing with chronic diseases...