Epidemiology is the most important and frequently used scientific basic tool for public health researchers. There are different definitions given for epidemiology, but it can be briefly defined as the process of detection, investigation, and analysis of the causes of diseases in the human populations. It is a methodology, which preventive medicine use to control and prevent the diseases also to improve the health status of the public in general. It is known that there is a heredity role in the majority of common human diseases because of that a multidisciplinary approach is required for a full understanding of the etiology of diseases. Many non-infectious chronic diseases which are estimated that associated with genetic structure of the human are still being investigated in the worldwide. Genetic epidemiology is fairly a new discipline that has to research very large different fields.
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Last date updated on May, 2014