Social Epidemiology has been defined as the branch of epidemiology that studies the social distribution and social determinants of health (Berkman and Kawachi 2000). As all aspects of human life are inextricably bound within the context of social relations, every conceivable epidemiological exposure is related to social factors. In this broad sense, all epidemiology is social epidemiology (K.aufman and Cooper 1999) with perhaps the latter discipline making explicit the analysis of the social determinants of health.